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<h1 class="menu-title">yt-offline</h1>
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<main>
<h1 id="staying-ahead-of-youtubes-bot-detection"><a class="header" href="#staying-ahead-of-youtubes-bot-detection">Staying ahead of YouTube’s bot detection</a></h1>
<p>YouTube increasingly fingerprints and rate-limits automated clients.
yt-offline ships a layered defense; understanding the layers makes the
difference between “everything downloads” and “constant captchas.”</p>
<p>In rough order of impact:</p>
<h2 id="1-be-logged-in-cookies"><a class="header" href="#1-be-logged-in-cookies">1. Be logged in (cookies)</a></h2>
<p>This is the single biggest factor. <strong>Anonymous requests get captcha-
walled the hardest.</strong> Provide a <code>cookies.txt</code> exported from a browser
where you are <strong>signed in to YouTube</strong>, or point yt-offline at the
browser profile directly.</p>
<p>A <em>valid</em> logged-in jar contains the auth cookies <code>SID</code>, <code>SAPISID</code>,
<code>__Secure-1PSID</code>, <code>__Secure-3PSID</code>, <code>LOGIN_INFO</code>, etc. A jar with only
<code>VISITOR_INFO1_LIVE</code>, <code>PREF</code>, <code>YSC</code> is <strong>anonymous</strong> — it’s not signed in
and actually makes detection <em>worse</em> than no cookies. yt-offline’s
Settings → Cookies panel warns you when your jar is anonymous or expired.</p>
<p>Two ways to supply cookies:</p>
<ul>
<li>
<p><strong>Export a <code>cookies.txt</code></strong> with a browser extension like <em>Get
cookies.txt LOCALLY</em>, then paste/upload it in Settings → Cookies. A
file in the working directory takes precedence over the browser option.</p>
</li>
<li>
<p><strong>Read the browser profile live</strong> by setting the cookie browser to a
yt-dlp <code>--cookies-from-browser</code> spec. Plain <code>firefox</code>/<code>chrome</code>/<code>brave</code>
works for default profiles; for a non-default profile (e.g. Brave’s
beta channel) use the full form:</p>
<pre><code>brave:/home/you/.config/BraveSoftware/Brave-Origin-Beta
</code></pre>
<p>The path is the <strong>profile root</strong> (yt-dlp appends the <code>Default</code>
subdirectory itself). The advantage: cookies are read fresh from the
live session each download, so they never go stale.</p>
</li>
</ul>
<blockquote>
<p>Cookies are session credentials — yt-offline never commits or transmits
<code>cookies.txt</code> unprompted, and redacts the cookie path out of any log
line shown in the UI.</p>
</blockquote>
<h2 id="2-tls-impersonation-curl_cffi"><a class="header" href="#2-tls-impersonation-curl_cffi">2. TLS impersonation (curl_cffi)</a></h2>
<p>yt-dlp’s <code>--impersonate</code> makes requests carry a real browser’s TLS
fingerprint (via <code>curl_cffi</code>), so the connection doesn’t <em>look</em> like a
script. The bundled install sets this up automatically and yt-offline
picks an impersonation target per platform.</p>
<p>If impersonation silently does nothing, it’s almost always a
<strong>yt-dlp ⇄ curl_cffi version mismatch</strong> — which is exactly why the
bundled install uses <strong>nightly</strong> yt-dlp (it accepts current curl_cffi;
stable lags and disables all impersonate targets when a newer curl_cffi
is present). See
<a href="./troubleshooting.html#impersonate-targets-show-unavailable">Troubleshooting → impersonation</a>.</p>
<h2 id="3-pot-tokens-proof-of-origin"><a class="header" href="#3-pot-tokens-proof-of-origin">3. POT tokens (Proof-of-Origin)</a></h2>
<p>YouTube increasingly binds a per-video <strong>Proof-of-Origin token</strong> to
playback; without one, format URLs come back empty. yt-offline can run
<a href="https://github.com/jim60105/bgutil-ytdlp-pot-provider-rs">bgutil-pot</a>, a
loopback HTTP server that mints these tokens, and point yt-dlp at it.</p>
<p>Enable <strong>Settings → Use POT token provider</strong> (requires the bundled
yt-dlp; the matching plugin installs into its venv) and click <strong>Install</strong>.</p>
<blockquote>
<p><strong>Version-skew footgun:</strong> the yt-dlp plugin must come from the <em>same
release</em> as the bgutil-pot server binary — <strong>not</strong> the PyPI package,
which versions independently and silently produces no tokens on a
mismatch. yt-offline’s installer handles this by unpacking the
version-matched plugin zip from the server’s release.</p>
</blockquote>
<h2 id="4-player-client-selection"><a class="header" href="#4-player-client-selection">4. Player-client selection</a></h2>
<p>YouTube cracks down on different internal “player clients” over time —
the <code>web</code> client is currently the most captcha-prone, while <code>tv</code> and
<code>mweb</code> are the least. yt-offline no longer forces <code>web</code>; it lets yt-dlp
pick good defaults. If a specific channel keeps hitting captchas, set a
client override (global or per-channel):</p>
<pre><code>tv,mweb
</code></pre>
<h2 id="5-throttling"><a class="header" href="#5-throttling">5. Throttling</a></h2>
<p>A burst of ~30 rapid requests is a classic trip-wire. yt-offline inserts
a small jittered pause between videos (a fixed cadence looks robotic; a
random one looks human) and, after any rate-limit hit, triples the
sleeps for the rest of the batch before recovering.</p>
<hr>
<p><strong>TL;DR for a clean setup:</strong> bundled (nightly) yt-dlp + fresh
<strong>logged-in</strong> cookies + POT provider enabled. That combination resolves
the vast majority of captcha / “Video unavailable” failures.</p>
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<h1 id="architecture"><a class="header" href="#architecture">Architecture</a></h1>
<p>For contributors. The repo’s <code>CLAUDE.md</code> is the terse version of this;
read both.</p>
<h2 id="two-front-ends-one-engine"><a class="header" href="#two-front-ends-one-engine">Two front-ends, one engine</a></h2>
<p><code>main.rs</code> dispatches: <code>--web</code> → <code>web::run()</code> (axum, blocks forever);
otherwise <code>app::App</code> (eframe/egui desktop GUI). <strong>Both share
<code>downloader::Downloader</code></strong>, the single source of truth for the yt-dlp job
lifecycle.</p>
<p><code>Downloader</code> is <strong>not</strong> async — it spawns an OS thread per yt-dlp process,
streams stdout/stderr back over an <code>mpsc</code> channel into each <code>Job</code>’s log
buffer, and the caller pumps <code>Downloader::poll()</code> regularly (the egui
frame loop and a web background task both do). Anything you add to
<code>Downloader</code> is automatically available to both UIs.</p>
<p><code>poll()</code> also drives the cross-cutting job machinery: auto-retry of
transient failures (cooldown + adaptive throttle), the hang watchdog, and
the post-download ffmpeg transcode pass. These work by capturing specs
onto the <code>Job</code> at <code>start()</code> time (<code>RetrySpec</code>, <code>ConvertSpec</code>) and acting
on them when the job changes state.</p>
<h2 id="the-settings-flow-the-easy-thing-to-get-wrong"><a class="header" href="#the-settings-flow-the-easy-thing-to-get-wrong">The settings flow (the easy thing to get wrong)</a></h2>
<p>Almost every configurable feature has the same five-touchpoint shape —
miss one and it silently half-works:</p>
<ol>
<li><code>config.rs</code> — a field/section + its <code>Default</code> + the <code>default_with_dir</code>
constructor.</li>
<li><code>download_options.rs</code> — an <code>Option&lt;…&gt;</code> per-channel override (None =
defer to global).</li>
<li><code>downloader.rs</code> — a resolver merging global config + per-channel
override into yt-dlp/ffmpeg args, plus a <code>pub</code> field on <code>Downloader</code>
holding the global default.</li>
<li><strong>Both</strong> UIs render the global setting <em>and</em> the per-channel override:
desktop in <code>app.rs</code>, web in <code>web_ui/index.html</code> <strong>and</strong> <code>web.rs</code>’s
<code>SettingsPayload</code> (GET reads config, POST writes config + pushes onto
the live <code>Downloader</code>).</li>
<li>Seed the <code>Downloader</code> field at construction <strong>and</strong> on settings-save,
in <strong>both</strong> <code>app.rs</code> and <code>web.rs</code>.</li>
</ol>
<p><code>subtitle_defaults</code>, <code>youtube_player_clients</code>, and <code>convert_defaults</code> are
complete worked examples — grep one end-to-end before adding a setting.</p>
<h2 id="filesystem-layout"><a class="header" href="#filesystem-layout">Filesystem layout</a></h2>
<p><code>platform::platform_root(channels_root, platform)</code> =
<code>channels_root.join(dir_name)</code>. <strong>All</strong> platforms (including YouTube,
whose <code>dir_name</code> is <code>channels</code>) nest under the one configured
<code>backup.directory</code>. <code>.source-url</code> sidecars in each creator folder let
re-checks recover the exact URL. Library scanning (<code>library.rs</code>) is
parallel and consults a <code>(path, mtime)</code> SQLite cache to skip re-parsing
unchanged <code>info.json</code> sidecars.</p>
<h2 id="persistence"><a class="header" href="#persistence">Persistence</a></h2>
<p><code>database.rs</code> wraps an r2d2 SQLite pool. <code>Database</code> is cheaply <code>Clone</code>
(the pool is an <code>Arc</code>), so the parallel scanner takes its own handle.
Schema lives in <code>init_schema()</code>; new columns are added via idempotent
<code>ALTER TABLE … ADD COLUMN</code> that swallows the duplicate-column error (no
migration framework). The web UI keeps library/notes snapshots in memory;
mutating endpoints mirror DB writes onto those caches and bump a version
counter (the <code>/api/library</code> ETag) so reads stay consistent without a
rescan.</p>
<p>The long-lived <code>WebState</code> mutexes are accessed via
<code>util::LockExt::lock_recover()</code>, which recovers a poisoned lock instead of
cascading one handler’s panic into a dead server.</p>
<h2 id="web-ui-is-one-embedded-file"><a class="header" href="#web-ui-is-one-embedded-file">Web UI is one embedded file</a></h2>
<p><code>web_ui/index.html</code> is the entire SPA (HTML+CSS+JS), <code>include_str!</code>-baked
into the binary at compile time — editing it requires a rebuild. Served
<code>Cache-Control: no-store</code> so binary upgrades don’t strand stale tabs.
Progress streams over <code>/ws/progress</code> (WebSocket) with an HTTP-poll
fallback.</p>
<h2 id="anti-bot-subsystems"><a class="header" href="#anti-bot-subsystems">Anti-bot subsystems</a></h2>
<p><code>ytdlp_bin.rs</code> manages the optional self-contained venv at
<code>~/.local/share/yt-offline/</code> (nightly <code>yt-dlp[default]</code> + <code>curl_cffi</code> +
bundled <code>deno</code>). <code>pot_provider.rs</code> runs <code>bgutil-pot</code> for Proof-of-Origin
tokens — its yt-dlp plugin must come from the same release as the server
binary. <code>error_class.rs</code> pattern-matches yt-dlp stderr into actionable
classes (order matters in <code>classify()</code>: the captcha “Video unavailable”
wall is RateLimited, not NotFound).</p>
<h2 id="tests"><a class="header" href="#tests">Tests</a></h2>
<ul>
<li>Unit tests are inline <code>#[cfg(test)]</code> modules (parsers, resolvers, the
error classifier, DB merge logic).</li>
<li><code>tests/api.rs</code> spawns the <strong>real</strong> <code>--web</code> binary against a scratch dir
and drives the HTTP API with curl — genuine end-to-end coverage of the
axum + SQLite + config stack.</li>
</ul>
<p><code>cargo test</code> runs both. (A <code>.forgejo/workflows/test.yml</code> CI definition
exists, but Codeberg runs Woodpecker rather than Forgejo Actions, so it
doesn’t execute there without a self-hosted runner — run the suite
locally.)</p>
<h2 id="platform-support"><a class="header" href="#platform-support">Platform support</a></h2>
<p>Tray (<code>ksni</code>) and file dialogs (<code>rfd</code> xdg-portal) are Linux-only / no-GTK
by design — that’s why packaging avoids a GTK dependency. Windows/macOS
aren’t first-class yet: the tray needs a per-OS backend before a clean
cross-build. The rest (eframe/wgpu, axum, rusqlite-bundled) already
compiles cross-platform, and <code>ytdlp_bin</code> already has <code>cfg!(windows)</code>
branches.</p>
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block.classList.remove('language-rust');
});
code_nodes
.filter(function(node) {
return !node.classList.contains('editable');
})
.forEach(function(block) {
hljs.highlightBlock(block);
});
} else {
code_nodes.forEach(function(block) {
hljs.highlightBlock(block);
});
}
// Adding the hljs class gives code blocks the color css
// even if highlighting doesn't apply
code_nodes.forEach(function(block) {
block.classList.add('hljs');
});
Array.from(document.querySelectorAll('code.hljs')).forEach(function(block) {
const lines = Array.from(block.querySelectorAll('.boring'));
// If no lines were hidden, return
if (!lines.length) {
return;
}
block.classList.add('hide-boring');
const buttons = document.createElement('div');
buttons.className = 'buttons';
buttons.innerHTML = '<button title="Show hidden lines" \
aria-label="Show hidden lines"></button>';
buttons.firstChild.innerHTML = document.getElementById('fa-eye').innerHTML;
// add expand button
const pre_block = block.parentNode;
pre_block.insertBefore(buttons, pre_block.firstChild);
buttons.firstChild.addEventListener('click', function(e) {
if (this.title === 'Show hidden lines') {
this.innerHTML = document.getElementById('fa-eye-slash').innerHTML;
this.title = 'Hide lines';
this.setAttribute('aria-label', e.target.title);
block.classList.remove('hide-boring');
} else if (this.title === 'Hide lines') {
this.innerHTML = document.getElementById('fa-eye').innerHTML;
this.title = 'Show hidden lines';
this.setAttribute('aria-label', e.target.title);
block.classList.add('hide-boring');
}
});
});
if (window.playground_copyable) {
Array.from(document.querySelectorAll('pre code')).forEach(function(block) {
const pre_block = block.parentNode;
if (!pre_block.classList.contains('playground')) {
let buttons = pre_block.querySelector('.buttons');
if (!buttons) {
buttons = document.createElement('div');
buttons.className = 'buttons';
pre_block.insertBefore(buttons, pre_block.firstChild);
}
const clipButton = document.createElement('button');
clipButton.className = 'clip-button';
clipButton.title = 'Copy to clipboard';
clipButton.setAttribute('aria-label', clipButton.title);
clipButton.innerHTML = '<i class="tooltiptext"></i>';
buttons.insertBefore(clipButton, buttons.firstChild);
}
});
}
// Process playground code blocks
Array.from(document.querySelectorAll('.playground')).forEach(function(pre_block) {
// Add play button
let buttons = pre_block.querySelector('.buttons');
if (!buttons) {
buttons = document.createElement('div');
buttons.className = 'buttons';
pre_block.insertBefore(buttons, pre_block.firstChild);
}
const runCodeButton = document.createElement('button');
runCodeButton.className = 'play-button';
runCodeButton.hidden = true;
runCodeButton.title = 'Run this code';
runCodeButton.setAttribute('aria-label', runCodeButton.title);
runCodeButton.innerHTML = document.getElementById('fa-play').innerHTML;
buttons.insertBefore(runCodeButton, buttons.firstChild);
runCodeButton.addEventListener('click', () => {
run_rust_code(pre_block);
});
if (window.playground_copyable) {
const copyCodeClipboardButton = document.createElement('button');
copyCodeClipboardButton.className = 'clip-button';
copyCodeClipboardButton.innerHTML = '<i class="tooltiptext"></i>';
copyCodeClipboardButton.title = 'Copy to clipboard';
copyCodeClipboardButton.setAttribute('aria-label', copyCodeClipboardButton.title);
buttons.insertBefore(copyCodeClipboardButton, buttons.firstChild);
}
const code_block = pre_block.querySelector('code');
if (window.ace && code_block.classList.contains('editable')) {
const undoChangesButton = document.createElement('button');
undoChangesButton.className = 'reset-button';
undoChangesButton.title = 'Undo changes';
undoChangesButton.setAttribute('aria-label', undoChangesButton.title);
undoChangesButton.innerHTML +=
document.getElementById('fa-clock-rotate-left').innerHTML;
buttons.insertBefore(undoChangesButton, buttons.firstChild);
undoChangesButton.addEventListener('click', function() {
const editor = window.ace.edit(code_block);
editor.setValue(editor.originalCode);
editor.clearSelection();
});
}
});
})();
(function themes() {
const html = document.querySelector('html');
const themeToggleButton = document.getElementById('mdbook-theme-toggle');
const themePopup = document.getElementById('mdbook-theme-list');
const themeColorMetaTag = document.querySelector('meta[name="theme-color"]');
const themeIds = [];
themePopup.querySelectorAll('button.theme').forEach(function(el) {
themeIds.push(el.id);
});
const stylesheets = {
ayuHighlight: document.querySelector('#mdbook-ayu-highlight-css'),
tomorrowNight: document.querySelector('#mdbook-tomorrow-night-css'),
highlight: document.querySelector('#mdbook-highlight-css'),
};
function showThemes() {
themePopup.style.display = 'block';
themeToggleButton.setAttribute('aria-expanded', true);
themePopup.querySelector('button#mdbook-theme-' + get_theme()).focus();
}
function updateThemeSelected() {
themePopup.querySelectorAll('.theme-selected').forEach(function(el) {
el.classList.remove('theme-selected');
});
const selected = get_saved_theme() ?? 'default_theme';
let element = themePopup.querySelector('button#mdbook-theme-' + selected);
if (element === null) {
// Fall back in case there is no "Default" item.
element = themePopup.querySelector('button#mdbook-theme-' + get_theme());
}
element.classList.add('theme-selected');
}
function hideThemes() {
themePopup.style.display = 'none';
themeToggleButton.setAttribute('aria-expanded', false);
themeToggleButton.focus();
}
function get_saved_theme() {
let theme = null;
try {
theme = localStorage.getItem('mdbook-theme');
} catch {
// ignore error.
}
return theme;
}
function delete_saved_theme() {
localStorage.removeItem('mdbook-theme');
}
function get_theme() {
const theme = get_saved_theme();
if (theme === null || theme === undefined || !themeIds.includes('mdbook-theme-' + theme)) {
if (typeof default_dark_theme === 'undefined') {
// A customized index.hbs might not define this, so fall back to
// old behavior of determining the default on page load.
return default_theme;
}
return window.matchMedia('(prefers-color-scheme: dark)').matches
? default_dark_theme
: default_light_theme;
} else {
return theme;
}
}
let previousTheme = default_theme;
function set_theme(theme, store = true) {
let ace_theme;
if (theme === 'coal' || theme === 'navy') {
stylesheets.ayuHighlight.disabled = true;
stylesheets.tomorrowNight.disabled = false;
stylesheets.highlight.disabled = true;
ace_theme = 'ace/theme/tomorrow_night';
} else if (theme === 'ayu') {
stylesheets.ayuHighlight.disabled = false;
stylesheets.tomorrowNight.disabled = true;
stylesheets.highlight.disabled = true;
ace_theme = 'ace/theme/tomorrow_night';
} else {
stylesheets.ayuHighlight.disabled = true;
stylesheets.tomorrowNight.disabled = true;
stylesheets.highlight.disabled = false;
ace_theme = 'ace/theme/dawn';
}
setTimeout(function() {
themeColorMetaTag.content = getComputedStyle(document.documentElement).backgroundColor;
}, 1);
if (window.ace && window.editors) {
window.editors.forEach(function(editor) {
editor.setTheme(ace_theme);
});
}
if (store) {
try {
localStorage.setItem('mdbook-theme', theme);
} catch {
// ignore error.
}
}
html.classList.remove(previousTheme);
html.classList.add(theme);
previousTheme = theme;
updateThemeSelected();
}
const query = window.matchMedia('(prefers-color-scheme: dark)');
query.onchange = function() {
set_theme(get_theme(), false);
};
// Set theme.
set_theme(get_theme(), false);
themeToggleButton.addEventListener('click', function() {
if (themePopup.style.display === 'block') {
hideThemes();
} else {
showThemes();
}
});
themePopup.addEventListener('click', function(e) {
let theme;
if (e.target.className === 'theme') {
theme = e.target.id;
} else if (e.target.parentElement.className === 'theme') {
theme = e.target.parentElement.id;
} else {
return;
}
theme = theme.replace(/^mdbook-theme-/, '');
if (theme === 'default_theme' || theme === null) {
delete_saved_theme();
set_theme(get_theme(), false);
} else {
set_theme(theme);
}
});
themePopup.addEventListener('focusout', function(e) {
// e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
if (!!e.relatedTarget &&
!themeToggleButton.contains(e.relatedTarget) &&
!themePopup.contains(e.relatedTarget)
) {
hideThemes();
}
});
// Should not be needed, but it works around an issue on macOS & iOS:
// https://github.com/rust-lang/mdBook/issues/628
document.addEventListener('click', function(e) {
if (themePopup.style.display === 'block' &&
!themeToggleButton.contains(e.target) &&
!themePopup.contains(e.target)
) {
hideThemes();
}
});
document.addEventListener('keydown', function(e) {
if (e.altKey || e.ctrlKey || e.metaKey || e.shiftKey) {
return;
}
if (!themePopup.contains(e.target)) {
return;
}
let li;
switch (e.key) {
case 'Escape':
e.preventDefault();
hideThemes();
break;
case 'ArrowUp':
e.preventDefault();
li = document.activeElement.parentElement;
if (li && li.previousElementSibling) {
li.previousElementSibling.querySelector('button').focus();
}
break;
case 'ArrowDown':
e.preventDefault();
li = document.activeElement.parentElement;
if (li && li.nextElementSibling) {
li.nextElementSibling.querySelector('button').focus();
}
break;
case 'Home':
e.preventDefault();
themePopup.querySelector('li:first-child button').focus();
break;
case 'End':
e.preventDefault();
themePopup.querySelector('li:last-child button').focus();
break;
}
});
})();
(function sidebar() {
const sidebar = document.getElementById('mdbook-sidebar');
const sidebarLinks = document.querySelectorAll('#mdbook-sidebar a');
const sidebarToggleButton = document.getElementById('mdbook-sidebar-toggle');
const sidebarResizeHandle = document.getElementById('mdbook-sidebar-resize-handle');
const sidebarCheckbox = document.getElementById('mdbook-sidebar-toggle-anchor');
let firstContact = null;
/* Because we cannot change the `display` using only CSS after/before the transition, we
need JS to do it. We change the display to prevent the browsers search to find text inside
the collapsed sidebar. */
if (!document.documentElement.classList.contains('sidebar-visible')) {
sidebar.style.display = 'none';
}
sidebar.addEventListener('transitionend', () => {
/* We only change the display to "none" if we're collapsing the sidebar. */
if (!sidebarCheckbox.checked) {
sidebar.style.display = 'none';
}
});
sidebarToggleButton.addEventListener('click', () => {
/* To allow the sidebar expansion animation, we first need to put back the display. */
if (!sidebarCheckbox.checked) {
sidebar.style.display = '';
// Workaround for Safari skipping the animation when changing
// `display` and a transform in the same event loop. This forces a
// reflow after updating the display.
sidebar.offsetHeight;
}
});
function showSidebar() {
document.documentElement.classList.add('sidebar-visible');
Array.from(sidebarLinks).forEach(function(link) {
link.setAttribute('tabIndex', 0);
});
sidebarToggleButton.setAttribute('aria-expanded', true);
sidebar.setAttribute('aria-hidden', false);
try {
localStorage.setItem('mdbook-sidebar', 'visible');
} catch {
// Ignore error.
}
}
function hideSidebar() {
document.documentElement.classList.remove('sidebar-visible');
Array.from(sidebarLinks).forEach(function(link) {
link.setAttribute('tabIndex', -1);
});
sidebarToggleButton.setAttribute('aria-expanded', false);
sidebar.setAttribute('aria-hidden', true);
try {
localStorage.setItem('mdbook-sidebar', 'hidden');
} catch {
// Ignore error.
}
}
// Toggle sidebar
sidebarCheckbox.addEventListener('change', function sidebarToggle() {
if (sidebarCheckbox.checked) {
const current_width = parseInt(
document.documentElement.style.getPropertyValue('--sidebar-target-width'), 10);
if (current_width < 150) {
document.documentElement.style.setProperty('--sidebar-target-width', '150px');
}
showSidebar();
} else {
hideSidebar();
}
});
sidebarResizeHandle.addEventListener('mousedown', initResize, false);
function initResize() {
window.addEventListener('mousemove', resize, false);
window.addEventListener('mouseup', stopResize, false);
document.documentElement.classList.add('sidebar-resizing');
}
function resize(e) {
let pos = e.clientX - sidebar.offsetLeft;
if (pos < 20) {
hideSidebar();
} else {
if (!document.documentElement.classList.contains('sidebar-visible')) {
showSidebar();
}
pos = Math.min(pos, window.innerWidth - 100);
document.documentElement.style.setProperty('--sidebar-target-width', pos + 'px');
}
}
//on mouseup remove windows functions mousemove & mouseup
function stopResize() {
document.documentElement.classList.remove('sidebar-resizing');
window.removeEventListener('mousemove', resize, false);
window.removeEventListener('mouseup', stopResize, false);
}
document.addEventListener('touchstart', function(e) {
firstContact = {
x: e.touches[0].clientX,
time: Date.now(),
};
}, { passive: true });
document.addEventListener('touchmove', function(e) {
if (!firstContact) {
return;
}
const curX = e.touches[0].clientX;
const xDiff = curX - firstContact.x,
tDiff = Date.now() - firstContact.time;
if (tDiff < 250 && Math.abs(xDiff) >= 150) {
if (xDiff >= 0 && firstContact.x < Math.min(document.body.clientWidth * 0.25, 300)) {
showSidebar();
} else if (xDiff < 0 && curX < 300) {
hideSidebar();
}
firstContact = null;
}
}, { passive: true });
})();
(function chapterNavigation() {
document.addEventListener('keydown', function(e) {
if (e.altKey ||
e.ctrlKey ||
e.metaKey ||
window.search && window.search.hasFocus() ||
mdbook_something_else_has_focus(e)
) {
return;
}
const html = document.querySelector('html');
function next() {
const nextButton = document.querySelector('.nav-chapters.next');
if (nextButton) {
window.location.href = nextButton.href;
}
}
function prev() {
const previousButton = document.querySelector('.nav-chapters.previous');
if (previousButton) {
window.location.href = previousButton.href;
}
}
function showHelp() {
const container = document.getElementById('mdbook-help-container');
const overlay = document.getElementById('mdbook-help-popup');
container.style.display = 'flex';
// Clicking outside the popup will dismiss it.
const mouseHandler = event => {
if (overlay.contains(event.target)) {
return;
}
if (event.button !== 0) {
return;
}
event.preventDefault();
event.stopPropagation();
document.removeEventListener('mousedown', mouseHandler);
hideHelp();
};
// Pressing esc will dismiss the popup.
const escapeKeyHandler = event => {
if (event.key === 'Escape') {
event.preventDefault();
event.stopPropagation();
document.removeEventListener('keydown', escapeKeyHandler, true);
hideHelp();
}
};
document.addEventListener('keydown', escapeKeyHandler, true);
document.getElementById('mdbook-help-container')
.addEventListener('mousedown', mouseHandler);
}
function hideHelp() {
document.getElementById('mdbook-help-container').style.display = 'none';
}
// Usually needs the Shift key to be pressed
switch (e.key) {
case '?':
e.preventDefault();
showHelp();
break;
}
// Rest of the keys are only active when the Shift key is not pressed
if (e.shiftKey) {
return;
}
switch (e.key) {
case 'ArrowRight':
e.preventDefault();
if (html.dir === 'rtl') {
prev();
} else {
next();
}
break;
case 'ArrowLeft':
e.preventDefault();
if (html.dir === 'rtl') {
next();
} else {
prev();
}
break;
}
});
})();
(function clipboard() {
const clipButtons = document.querySelectorAll('.clip-button');
function hideTooltip(elem) {
elem.firstChild.innerText = '';
elem.className = 'clip-button';
}
function showTooltip(elem, msg) {
elem.firstChild.innerText = msg;
elem.className = 'clip-button tooltipped';
}
const clipboardSnippets = new ClipboardJS('.clip-button', {
text: function(trigger) {
hideTooltip(trigger);
const playground = trigger.closest('pre');
return playground_text(playground, false);
},
});
Array.from(clipButtons).forEach(function(clipButton) {
clipButton.addEventListener('mouseout', function(e) {
hideTooltip(e.currentTarget);
});
});
clipboardSnippets.on('success', function(e) {
e.clearSelection();
showTooltip(e.trigger, 'Copied!');
});
clipboardSnippets.on('error', function(e) {
showTooltip(e.trigger, 'Clipboard error!');
});
})();
(function scrollToTop() {
const menuTitle = document.querySelector('.menu-title');
menuTitle.addEventListener('click', function() {
document.scrollingElement.scrollTo({ top: 0, behavior: 'smooth' });
});
})();
(function controllMenu() {
const menu = document.getElementById('mdbook-menu-bar');
(function controllPosition() {
let scrollTop = document.scrollingElement.scrollTop;
let prevScrollTop = scrollTop;
const minMenuY = -menu.clientHeight - 50;
// When the script loads, the page can be at any scroll (e.g. if you refresh it).
menu.style.top = scrollTop + 'px';
// Same as parseInt(menu.style.top.slice(0, -2), but faster
let topCache = menu.style.top.slice(0, -2);
menu.classList.remove('sticky');
let stickyCache = false; // Same as menu.classList.contains('sticky'), but faster
document.addEventListener('scroll', function() {
scrollTop = Math.max(document.scrollingElement.scrollTop, 0);
// `null` means that it doesn't need to be updated
let nextSticky = null;
let nextTop = null;
const scrollDown = scrollTop > prevScrollTop;
const menuPosAbsoluteY = topCache - scrollTop;
if (scrollDown) {
nextSticky = false;
if (menuPosAbsoluteY > 0) {
nextTop = prevScrollTop;
}
} else {
if (menuPosAbsoluteY > 0) {
nextSticky = true;
} else if (menuPosAbsoluteY < minMenuY) {
nextTop = prevScrollTop + minMenuY;
}
}
if (nextSticky === true && stickyCache === false) {
menu.classList.add('sticky');
stickyCache = true;
} else if (nextSticky === false && stickyCache === true) {
menu.classList.remove('sticky');
stickyCache = false;
}
if (nextTop !== null) {
menu.style.top = nextTop + 'px';
topCache = nextTop;
}
prevScrollTop = scrollTop;
}, { passive: true });
})();
(function controllBorder() {
function updateBorder() {
if (menu.offsetTop === 0) {
menu.classList.remove('bordered');
} else {
menu.classList.add('bordered');
}
}
updateBorder();
document.addEventListener('scroll', updateBorder, { passive: true });
})();
})();

7
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/* CSS for UI elements (a.k.a. chrome) */
html {
scrollbar-color: var(--scrollbar) transparent;
}
#mdbook-searchresults a,
.content a:link,
a:visited,
a > .hljs {
color: var(--links);
}
/*
mdbook-body-container is necessary because mobile browsers don't seem to like
overflow-x on the body tag when there is a <meta name="viewport"> tag.
*/
#mdbook-body-container {
/*
This is used when the sidebar pushes the body content off the side of
the screen on small screens. Without it, dragging on mobile Safari
will want to reposition the viewport in a weird way.
*/
overflow-x: clip;
}
/* Menu Bar */
#mdbook-menu-bar,
#mdbook-menu-bar-hover-placeholder {
z-index: 101;
margin: auto calc(0px - var(--page-padding));
}
#mdbook-menu-bar {
position: relative;
display: flex;
flex-wrap: wrap;
background-color: var(--bg);
border-block-end-color: var(--bg);
border-block-end-width: 1px;
border-block-end-style: solid;
}
#mdbook-menu-bar.sticky,
#mdbook-menu-bar-hover-placeholder:hover + #mdbook-menu-bar,
#mdbook-menu-bar:hover,
html.sidebar-visible #mdbook-menu-bar {
position: -webkit-sticky;
position: sticky;
top: 0 !important;
}
#mdbook-menu-bar-hover-placeholder {
position: sticky;
position: -webkit-sticky;
top: 0;
height: var(--menu-bar-height);
}
#mdbook-menu-bar.bordered {
border-block-end-color: var(--table-border-color);
}
#mdbook-menu-bar .fa-svg, #mdbook-menu-bar .icon-button {
position: relative;
padding: 0 8px;
z-index: 10;
line-height: var(--menu-bar-height);
cursor: pointer;
transition: color 0.5s;
}
@media only screen and (max-width: 420px) {
#mdbook-menu-bar .fa-svg, #mdbook-menu-bar .icon-button {
padding: 0 5px;
}
}
.icon-button {
border: none;
background: none;
padding: 0;
color: inherit;
}
.icon-button .fa-svg {
margin: 0;
}
.right-buttons {
margin: 0 15px;
}
.right-buttons a {
text-decoration: none;
}
.left-buttons {
display: flex;
margin: 0 5px;
}
html:not(.js) .left-buttons button {
display: none;
}
.menu-title {
display: inline-block;
font-weight: 200;
font-size: 2.4rem;
line-height: var(--menu-bar-height);
text-align: center;
margin: 0;
flex: 1;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
.menu-title {
cursor: pointer;
}
.menu-bar,
.menu-bar:visited,
.nav-chapters,
.nav-chapters:visited,
.mobile-nav-chapters,
.mobile-nav-chapters:visited,
.menu-bar .icon-button,
.menu-bar a .fa-svg {
color: var(--icons);
}
.menu-bar .fa-svg:hover,
.menu-bar .icon-button:hover,
.nav-chapters:hover,
.mobile-nav-chapters .fa-svg:hover {
color: var(--icons-hover);
}
/* Nav Icons */
.nav-chapters {
font-size: 2.5em;
text-align: center;
text-decoration: none;
position: fixed;
top: 0;
bottom: 0;
margin: 0;
max-width: 150px;
min-width: 90px;
display: flex;
justify-content: center;
align-content: center;
flex-direction: column;
transition: color 0.5s, background-color 0.5s;
}
.nav-chapters:hover {
text-decoration: none;
background-color: var(--theme-hover);
transition: background-color 0.15s, color 0.15s;
}
.nav-wrapper {
margin-block-start: 50px;
display: none;
}
.mobile-nav-chapters {
font-size: 2.5em;
text-align: center;
text-decoration: none;
width: 90px;
border-radius: 5px;
background-color: var(--sidebar-bg);
}
/* Only Firefox supports flow-relative values */
.previous { float: left; }
[dir=rtl] .previous { float: right; }
/* Only Firefox supports flow-relative values */
.next {
float: right;
right: var(--page-padding);
}
[dir=rtl] .next {
float: left;
right: unset;
left: var(--page-padding);
}
@media only screen and (max-width: 1080px) {
.nav-wide-wrapper { display: none; }
.nav-wrapper { display: block; }
}
/* sidebar-visible */
@media only screen and (max-width: 1380px) {
#mdbook-sidebar-toggle-anchor:checked ~ .page-wrapper .nav-wide-wrapper { display: none; }
#mdbook-sidebar-toggle-anchor:checked ~ .page-wrapper .nav-wrapper { display: block; }
}
/* Inline code */
:not(pre) > .hljs {
display: inline;
padding: 0.1em 0.3em;
border-radius: 3px;
}
:not(pre):not(a) > .hljs {
color: var(--inline-code-color);
overflow-x: initial;
}
a:hover > .hljs {
text-decoration: underline;
}
pre {
position: relative;
}
pre > .buttons {
position: absolute;
z-index: 100;
right: 0px;
top: 2px;
margin: 0px;
padding: 2px 0px;
color: var(--sidebar-fg);
cursor: pointer;
visibility: hidden;
opacity: 0;
transition: visibility 0.1s linear, opacity 0.1s linear;
}
pre:hover > .buttons {
visibility: visible;
opacity: 1
}
pre > .buttons :hover {
color: var(--sidebar-active);
border-color: var(--icons-hover);
background-color: var(--theme-hover);
}
pre > .buttons button {
cursor: inherit;
margin: 0px 5px;
padding: 2px 3px 0px 4px;
font-size: 23px;
border-style: solid;
border-width: 1px;
border-radius: 4px;
border-color: var(--icons);
background-color: var(--theme-popup-bg);
transition: 100ms;
transition-property: color,border-color,background-color;
color: var(--icons);
}
pre > .buttons button.clip-button {
padding: 2px 4px 0px 6px;
}
pre > .buttons button.clip-button::before {
/* clipboard image from octicons (https://github.com/primer/octicons/tree/v2.0.0) MIT license
*/
content: url('data:image/svg+xml,<svg width="21" height="20" viewBox="0 0 24 25" \
xmlns="http://www.w3.org/2000/svg" aria-label="Copy to clipboard">\
<path d="M18 20h2v3c0 1-1 2-2 2H2c-.998 0-2-1-2-2V5c0-.911.755-1.667 1.667-1.667h5A3.323 3.323 0 \
0110 0a3.323 3.323 0 013.333 3.333h5C19.245 3.333 20 4.09 20 5v8.333h-2V9H2v14h16v-3zM3 \
7h14c0-.911-.793-1.667-1.75-1.667H13.5c-.957 0-1.75-.755-1.75-1.666C11.75 2.755 10.957 2 10 \
2s-1.75.755-1.75 1.667c0 .911-.793 1.666-1.75 1.666H4.75C3.793 5.333 3 6.09 3 7z"/>\
<path d="M4 19h6v2H4zM12 11H4v2h8zM4 17h4v-2H4zM15 15v-3l-4.5 4.5L15 21v-3l8.027-.032L23 15z"/>\
</svg>');
filter: var(--copy-button-filter);
}
pre > .buttons button.clip-button:hover::before {
filter: var(--copy-button-filter-hover);
}
@media (pointer: coarse) {
pre > .buttons button {
/* On mobile, make it easier to tap buttons. */
padding: 0.3rem 1rem;
}
.sidebar-resize-indicator {
/* Hide resize indicator on devices with limited accuracy */
display: none;
}
}
pre > code {
display: block;
padding: 1rem;
}
/* FIXME: ACE editors overlap their buttons because ACE does absolute
positioning within the code block which breaks padding. The only solution I
can think of is to move the padding to the outer pre tag (or insert a div
wrapper), but that would require fixing a whole bunch of CSS rules.
*/
.hljs.ace_editor {
padding: 0rem 0rem;
}
pre > .result {
margin-block-start: 10px;
}
/* Search */
#mdbook-searchresults a {
text-decoration: none;
}
mark {
border-radius: 2px;
padding-block-start: 0;
padding-block-end: 1px;
padding-inline-start: 3px;
padding-inline-end: 3px;
margin-block-start: 0;
margin-block-end: -1px;
margin-inline-start: -3px;
margin-inline-end: -3px;
background-color: var(--search-mark-bg);
transition: background-color 300ms linear;
cursor: pointer;
}
mark.fade-out {
background-color: rgba(0,0,0,0) !important;
cursor: auto;
}
.searchbar-outer {
margin-inline-start: auto;
margin-inline-end: auto;
max-width: var(--content-max-width);
}
#mdbook-searchbar-outer.searching #mdbook-searchbar {
padding-right: 30px;
}
#mdbook-searchbar-outer .spinner-wrapper {
display: none;
}
#mdbook-searchbar-outer.searching .spinner-wrapper {
display: block;
}
.search-wrapper {
position: relative;
}
.spinner-wrapper {
--spinner-margin: 2px;
position: absolute;
margin-block-start: calc(var(--searchbar-margin-block-start) + var(--spinner-margin));
right: var(--spinner-margin);
top: 0;
bottom: var(--spinner-margin);
padding: 6px;
background-color: var(--bg);
}
#fa-spin {
animation: rotating 2s linear infinite;
display: inline-block;
}
@keyframes rotating {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}
#mdbook-searchbar {
width: 100%;
margin-block-start: var(--searchbar-margin-block-start);
margin-block-end: 0;
margin-inline-start: auto;
margin-inline-end: auto;
padding: 10px 16px;
transition: box-shadow 300ms ease-in-out;
border: 1px solid var(--searchbar-border-color);
border-radius: 3px;
background-color: var(--searchbar-bg);
color: var(--searchbar-fg);
}
#mdbook-searchbar:focus,
#mdbook-searchbar.active {
box-shadow: 0 0 3px var(--searchbar-shadow-color);
}
.searchresults-header {
font-weight: bold;
font-size: 1em;
padding-block-start: 18px;
padding-block-end: 0;
padding-inline-start: 5px;
padding-inline-end: 0;
color: var(--searchresults-header-fg);
}
.searchresults-outer {
margin-inline-start: auto;
margin-inline-end: auto;
max-width: var(--content-max-width);
border-block-end: 1px dashed var(--searchresults-border-color);
}
ul#mdbook-searchresults {
list-style: none;
padding-inline-start: 20px;
}
ul#mdbook-searchresults li {
margin: 10px 0px;
padding: 2px;
border-radius: 2px;
}
ul#mdbook-searchresults li.focus {
background-color: var(--searchresults-li-bg);
}
ul#mdbook-searchresults span.teaser {
display: block;
clear: both;
margin-block-start: 5px;
margin-block-end: 0;
margin-inline-start: 20px;
margin-inline-end: 0;
font-size: 0.8em;
}
ul#mdbook-searchresults span.teaser em {
font-weight: bold;
font-style: normal;
}
/* Sidebar */
.sidebar {
position: fixed;
left: 0;
top: 0;
bottom: 0;
width: var(--sidebar-width);
font-size: 0.875em;
box-sizing: border-box;
-webkit-overflow-scrolling: touch;
overscroll-behavior-y: contain;
background-color: var(--sidebar-bg);
color: var(--sidebar-fg);
}
.sidebar-iframe-inner {
--padding: 10px;
background-color: var(--sidebar-bg);
padding: var(--padding);
margin: 0;
font-size: 1.4rem;
color: var(--sidebar-fg);
min-height: calc(100vh - var(--padding) * 2);
}
.sidebar-iframe-outer {
border: none;
height: 100%;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
[dir=rtl] .sidebar { left: unset; right: 0; }
.sidebar-resizing {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
user-select: none;
}
html:not(.sidebar-resizing) .sidebar {
transition: transform 0.3s; /* Animation: slide away */
}
.sidebar code {
line-height: 2em;
}
.sidebar .sidebar-scrollbox {
overflow-y: auto;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
padding: 10px 10px;
}
.sidebar .sidebar-resize-handle {
position: absolute;
cursor: col-resize;
width: 0;
right: calc(var(--sidebar-resize-indicator-width) * -1);
top: 0;
bottom: 0;
display: flex;
align-items: center;
}
.sidebar-resize-handle .sidebar-resize-indicator {
width: 100%;
height: 16px;
color: var(--icons);
margin-inline-start: var(--sidebar-resize-indicator-space);
display: flex;
align-items: center;
justify-content: flex-start;
}
.sidebar-resize-handle .sidebar-resize-indicator::before {
content: "";
width: 2px;
height: 12px;
border-left: dotted 2px currentColor;
}
.sidebar-resize-handle .sidebar-resize-indicator::after {
content: "";
width: 2px;
height: 16px;
border-left: dotted 2px currentColor;
}
[dir=rtl] .sidebar .sidebar-resize-handle {
left: calc(var(--sidebar-resize-indicator-width) * -1);
right: unset;
}
.js .sidebar .sidebar-resize-handle {
cursor: col-resize;
width: calc(var(--sidebar-resize-indicator-width) - var(--sidebar-resize-indicator-space));
}
html:not(.js) .sidebar-resize-handle {
display: none;
}
/* sidebar-hidden */
#mdbook-sidebar-toggle-anchor:not(:checked) ~ .sidebar {
transform: translateX(calc(0px - var(--sidebar-width) - var(--sidebar-resize-indicator-width)));
}
[dir=rtl] #mdbook-sidebar-toggle-anchor:not(:checked) ~ .sidebar {
transform: translateX(calc(var(--sidebar-width) + var(--sidebar-resize-indicator-width)));
}
.sidebar::-webkit-scrollbar {
background: var(--sidebar-bg);
}
.sidebar::-webkit-scrollbar-thumb {
background: var(--scrollbar);
}
/* sidebar-visible */
#mdbook-sidebar-toggle-anchor:checked ~ .page-wrapper {
transform: translateX(calc(var(--sidebar-width) + var(--sidebar-resize-indicator-width)));
}
[dir=rtl] #mdbook-sidebar-toggle-anchor:checked ~ .page-wrapper {
transform: translateX(calc(0px - var(--sidebar-width) - var(--sidebar-resize-indicator-width)));
}
@media only screen and (min-width: 620px) {
#mdbook-sidebar-toggle-anchor:checked ~ .page-wrapper {
transform: none;
margin-inline-start: calc(var(--sidebar-width) + var(--sidebar-resize-indicator-width));
}
[dir=rtl] #mdbook-sidebar-toggle-anchor:checked ~ .page-wrapper {
transform: none;
}
}
.chapter {
list-style: none outside none;
padding-inline-start: 0;
line-height: 2.2em;
}
.chapter li {
color: var(--sidebar-non-existant);
}
/* This is a span wrapping the chapter link and the fold chevron. */
.chapter-link-wrapper {
/* Used to position the chevron to the right, allowing the text to wrap before it. */
display: flex;
}
.chapter li a {
/* Remove underlines. */
text-decoration: none;
color: var(--sidebar-fg);
}
.chapter li a:hover {
color: var(--sidebar-active);
}
.chapter li a.active {
color: var(--sidebar-active);
}
/* This is the toggle chevron. */
.chapter-fold-toggle {
cursor: pointer;
/* Positions the chevron to the side. */
margin-inline-start: auto;
padding: 0 10px;
user-select: none;
opacity: 0.68;
}
.chapter-fold-toggle div {
transition: transform 0.5s;
}
/* collapse the section */
.chapter li:not(.expanded) > ol {
display: none;
}
.chapter li.chapter-item {
line-height: 1.5em;
margin-block-start: 0.6em;
}
.chapter li.header-item {
/* Make sure there is plenty of spacing between sections so they don't blend in
with each other. */
margin-block-end: 0.5em;
/* Avoid too much spacing between lines when section heading word wraps so that
it can be distinguished between successive headings. */
line-height: 1.5em;
}
/* When expanded, rotate the chevron to point down. */
.chapter li.expanded > span > .chapter-fold-toggle div {
transform: rotate(90deg);
}
.chapter a.current-header {
color: var(--sidebar-active);
}
.on-this-page {
margin-left: 22px;
border-inline-start: 4px solid var(--sidebar-header-border-color);
padding-left: 8px;
}
.on-this-page > ol {
padding-left: 0;
}
/* Horizontal line in chapter list. */
.spacer {
width: 100%;
height: 3px;
margin: 5px 0px;
}
.chapter .spacer {
background-color: var(--sidebar-spacer);
}
/* On touch devices, add more vertical spacing to make it easier to tap links. */
@media (-moz-touch-enabled: 1), (pointer: coarse) {
.chapter li a { padding: 5px 0; }
.spacer { margin: 10px 0; }
}
.section {
list-style: none outside none;
padding-inline-start: 20px;
line-height: 1.9em;
}
/* Theme Menu Popup */
.theme-popup {
position: absolute;
left: 10px;
top: var(--menu-bar-height);
z-index: 1000;
border-radius: 4px;
font-size: 0.7em;
color: var(--fg);
background: var(--theme-popup-bg);
border: 1px solid var(--theme-popup-border);
margin: 0;
padding: 0;
list-style: none;
display: none;
/* Don't let the children's background extend past the rounded corners. */
overflow: hidden;
}
[dir=rtl] .theme-popup { left: unset; right: 10px; }
.theme-popup .default {
color: var(--icons);
}
.theme-popup .theme {
width: 100%;
border: 0;
margin: 0;
padding: 2px 20px;
line-height: 25px;
white-space: nowrap;
text-align: start;
cursor: pointer;
color: inherit;
background: inherit;
font-size: inherit;
}
.theme-popup .theme:hover {
background-color: var(--theme-hover);
}
.theme-selected::before {
display: inline-block;
content: "✓";
margin-inline-start: -14px;
width: 14px;
}
/* The container for the help popup that covers the whole window. */
#mdbook-help-container {
/* Position and size for the whole window. */
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
/* This uses flex layout (which is set in book.js), and centers the popup
in the window.*/
display: none;
align-items: center;
justify-content: center;
z-index: 1000;
/* Dim out the book while the popup is visible. */
background: var(--overlay-bg);
}
/* The popup help box. */
#mdbook-help-popup {
box-shadow: 0 4px 24px rgba(0,0,0,0.15);
min-width: 300px;
max-width: 500px;
width: 100%;
box-sizing: border-box;
display: flex;
flex-direction: column;
align-items: center;
background-color: var(--bg);
color: var(--fg);
border-width: 1px;
border-color: var(--theme-popup-border);
border-style: solid;
border-radius: 8px;
padding: 10px;
}
.mdbook-help-title {
text-align: center;
/* mdbook's margin for h2 is way too large. */
margin: 10px;
}

408
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/* Base styles and content styles */
:root {
/* Browser default font-size is 16px, this way 1 rem = 10px */
font-size: 62.5%;
color-scheme: var(--color-scheme);
}
html {
font-family: "Open Sans", sans-serif;
color: var(--fg);
background-color: var(--bg);
text-size-adjust: none;
-webkit-text-size-adjust: none;
}
body {
margin: 0;
font-size: 1.6rem;
overflow-x: hidden;
}
code {
font-family: var(--mono-font) !important;
font-size: var(--code-font-size);
direction: ltr !important;
}
/* make long words/inline code not x overflow */
main {
overflow-wrap: break-word;
}
/* make wide tables scroll if they overflow */
.table-wrapper {
overflow-x: auto;
}
/* Don't change font size in headers. */
h1 code, h2 code, h3 code, h4 code, h5 code, h6 code {
font-size: unset;
}
.left { float: left; }
.right { float: right; }
.boring { opacity: 0.6; }
.hide-boring .boring { display: none; }
.hidden { display: none !important; }
h2, h3 { margin-block-start: 2.5em; }
h4, h5 { margin-block-start: 2em; }
.header + .header h3,
.header + .header h4,
.header + .header h5 {
margin-block-start: 1em;
}
h1:target::before,
h2:target::before,
h3:target::before,
h4:target::before,
h5:target::before,
h6:target::before,
dt:target::before {
display: inline-block;
content: "»";
margin-inline-start: -30px;
width: 30px;
}
/* This is broken on Safari as of version 14, but is fixed
in Safari Technology Preview 117 which I think will be Safari 14.2.
https://bugs.webkit.org/show_bug.cgi?id=218076
*/
:target {
/* Safari does not support logical properties */
scroll-margin-top: calc(var(--menu-bar-height) + 0.5em);
}
.page {
outline: 0;
padding: 0 var(--page-padding);
margin-block-start: calc(0px - var(--menu-bar-height)); /* Compensate for the #mdbook-menu-bar-hover-placeholder */
}
.page-wrapper {
box-sizing: border-box;
background-color: var(--bg);
}
html:not(.js) .page-wrapper,
.js:not(.sidebar-resizing) .page-wrapper {
transition: margin-left 0.3s ease, transform 0.3s ease; /* Animation: slide away */
}
[dir=rtl]:not(.js) .page-wrapper,
[dir=rtl].js:not(.sidebar-resizing) .page-wrapper {
transition: margin-right 0.3s ease, transform 0.3s ease; /* Animation: slide away */
}
.content {
overflow-y: auto;
padding: 0 5px 50px 5px;
}
.content main {
margin-inline-start: auto;
margin-inline-end: auto;
max-width: var(--content-max-width);
}
.content p { line-height: 1.45em; }
.content ol { line-height: 1.45em; }
.content ul { line-height: 1.45em; }
.content a { text-decoration: none; }
.content a:hover { text-decoration: underline; }
.content img, .content video { max-width: 100%; }
.content .header:link,
.content .header:visited {
color: var(--fg);
}
.content .header:link,
.content .header:visited:hover {
text-decoration: none;
}
table {
margin: 0 auto;
border-collapse: collapse;
}
table td {
padding: 3px 20px;
border: 1px var(--table-border-color) solid;
}
table thead {
background: var(--table-header-bg);
}
table thead td {
font-weight: 700;
border: none;
}
table thead th {
padding: 3px 20px;
}
table thead tr {
border: 1px var(--table-header-bg) solid;
}
/* Alternate background colors for rows */
table tbody tr:nth-child(2n) {
background: var(--table-alternate-bg);
}
blockquote {
margin: 20px 0;
padding: 0 20px;
color: var(--fg);
background-color: var(--quote-bg);
border-block-start: .1em solid var(--quote-border);
border-block-end: .1em solid var(--quote-border);
}
/* TODO: Remove .warning in a future version of mdbook, it is replaced by
blockquote tags. */
.warning {
margin: 20px;
padding: 0 20px;
border-inline-start: 2px solid var(--warning-border);
}
.warning:before {
position: absolute;
width: 3rem;
height: 3rem;
margin-inline-start: calc(-1.5rem - 21px);
content: "ⓘ";
text-align: center;
background-color: var(--bg);
color: var(--warning-border);
font-weight: bold;
font-size: 2rem;
}
blockquote .warning:before {
background-color: var(--quote-bg);
}
kbd {
background-color: var(--table-border-color);
border-radius: 4px;
border: solid 1px var(--theme-popup-border);
box-shadow: inset 0 -1px 0 var(--theme-hover);
display: inline-block;
font-size: var(--code-font-size);
font-family: var(--mono-font);
line-height: 10px;
padding: 4px 5px;
vertical-align: middle;
}
sup {
/* Set the line-height for superscript and footnote references so that there
isn't an awkward space appearing above lines that contain the footnote.
See https://github.com/rust-lang/mdBook/pull/2443#discussion_r1813773583
for an explanation.
*/
line-height: 0;
}
.footnote-definition {
font-size: 0.9em;
}
/* The default spacing for a list is a little too large. */
.footnote-definition ul,
.footnote-definition ol {
padding-left: 20px;
}
.footnote-definition > li {
/* Required to position the ::before target */
position: relative;
}
.footnote-definition > li:target {
scroll-margin-top: 50vh;
}
.footnote-reference:target {
scroll-margin-top: 50vh;
}
/* Draws a border around the footnote (including the marker) when it is selected.
TODO: If there are multiple linkbacks, highlight which one you just came
from so you know which one to click.
*/
.footnote-definition > li:target::before {
border: 2px solid var(--footnote-highlight);
border-radius: 6px;
position: absolute;
top: -8px;
right: -8px;
bottom: -8px;
left: -32px;
pointer-events: none;
content: "";
}
/* Pulses the footnote reference so you can quickly see where you left off reading.
This could use some improvement.
*/
@media not (prefers-reduced-motion) {
.footnote-reference:target {
animation: fn-highlight 0.8s;
border-radius: 2px;
}
@keyframes fn-highlight {
from {
background-color: var(--footnote-highlight);
}
}
}
.tooltiptext {
position: absolute;
visibility: hidden;
color: #fff;
background-color: #333;
transform: translateX(-50%); /* Center by moving tooltip 50% of its width left */
left: -8px; /* Half of the width of the icon */
top: -35px;
font-size: 0.8em;
text-align: center;
border-radius: 6px;
padding: 5px 8px;
margin: 5px;
z-index: 1000;
}
.tooltipped .tooltiptext {
visibility: visible;
}
.chapter li.part-title {
color: var(--sidebar-fg);
margin: 5px 0px;
font-weight: bold;
}
.result-no-output {
font-style: italic;
}
.fa-svg svg {
width: 1em;
height: 1em;
fill: currentColor;
margin-bottom: -0.1em;
}
dt {
font-weight: bold;
margin-top: 0.5em;
margin-bottom: 0.1em;
}
/* This uses a CSS counter to add numbers to definitions, but only if there is
more than one definition. */
dl, dt {
counter-reset: dd-counter;
}
/* When there is more than one definition, increment the counter. The first
selector selects the first definition, and the second one selects definitions
2 and beyond.*/
dd:has(+ dd), dd + dd {
counter-increment: dd-counter;
/* Use flex display to help with positioning the numbers when there is a p
tag inside the definition. */
display: flex;
align-items: flex-start;
}
/* Shows the counter for definitions. The first selector selects the first
definition, and the second one selections definitions 2 and beyond.*/
dd:has(+ dd)::before, dd + dd::before {
content: counter(dd-counter) ". ";
font-weight: 600;
display: inline-block;
margin-right: 0.5em;
}
dd > p {
/* For loose definitions that have a p tag inside, don't add a bunch of
space before the definition. */
margin-top: 0;
}
/* Remove some excess space from the bottom. */
.blockquote-tag p:last-child {
margin-bottom: 2px;
}
.blockquote-tag {
/* Add some padding to make the vertical bar a little taller than the text.*/
padding: 2px 0px 2px 20px;
/* Add a solid color bar on the left side. */
border-inline-start-style: solid;
border-inline-start-width: 4px;
/* Disable the background color from normal blockquotes . */
background-color: inherit;
/* Disable border blocks from blockquotes. */
border-block-start: none;
border-block-end: none;
}
.blockquote-tag-title svg {
fill: currentColor;
/* Add space between the icon and the title. */
margin-right: 8px;
}
.blockquote-tag-note {
border-inline-start-color: var(--blockquote-note-color);
}
.blockquote-tag-tip {
border-inline-start-color: var(--blockquote-tip-color);
}
.blockquote-tag-important {
border-inline-start-color: var(--blockquote-important-color);
}
.blockquote-tag-warning {
border-inline-start-color: var(--blockquote-warning-color);
}
.blockquote-tag-caution {
border-inline-start-color: var(--blockquote-caution-color);
}
.blockquote-tag-note > .blockquote-tag-title {
color: var(--blockquote-note-color);
}
.blockquote-tag-tip > .blockquote-tag-title {
color: var(--blockquote-tip-color);
}
.blockquote-tag-important > .blockquote-tag-title {
color: var(--blockquote-important-color);
}
.blockquote-tag-warning > .blockquote-tag-title {
color: var(--blockquote-warning-color);
}
.blockquote-tag-caution > .blockquote-tag-title {
color: var(--blockquote-caution-color);
}
.blockquote-tag-title {
/* Slightly increase the weight for more emphasis. */
font-weight: 600;
/* Vertically center the icon with the text. */
display: flex;
align-items: center;
/* Remove default large margins for a more compact display. */
margin: 2px 0 8px 0;
}
.blockquote-tag-title .fa-svg {
fill: currentColor;
/* Add some space between the icon and the text. */
margin-right: 8px;
}

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#mdbook-sidebar,
#mdbook-menu-bar,
.nav-chapters,
.mobile-nav-chapters {
display: none;
}
#mdbook-page-wrapper.page-wrapper {
transform: none !important;
margin-inline-start: 0px;
overflow-y: initial;
}
#mdbook-content {
max-width: none;
margin: 0;
padding: 0;
}
.page {
overflow-y: initial;
}
code {
direction: ltr !important;
}
pre > .buttons {
z-index: 2;
}
a, a:visited, a:active, a:hover {
color: #4183c4;
text-decoration: none;
}
h1, h2, h3, h4, h5, h6 {
page-break-inside: avoid;
page-break-after: avoid;
}
pre, code {
page-break-inside: avoid;
white-space: pre-wrap;
}
.fa {
display: none !important;
}

383
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@ -0,0 +1,383 @@
/* Globals */
:root {
--sidebar-target-width: 300px;
--sidebar-width: min(var(--sidebar-target-width), 80vw);
--sidebar-resize-indicator-width: 8px;
--sidebar-resize-indicator-space: 2px;
--page-padding: 15px;
--content-max-width: 750px;
--menu-bar-height: 50px;
--mono-font: "Source Code Pro", Consolas, "Ubuntu Mono", Menlo, "DejaVu Sans Mono", monospace, monospace;
--code-font-size: 0.875em; /* please adjust the ace font size accordingly in editor.js */
--searchbar-margin-block-start: 5px;
}
/* Themes */
.ayu {
--bg: hsl(210, 25%, 8%);
--fg: #c5c5c5;
--sidebar-bg: #14191f;
--sidebar-fg: #c8c9db;
--sidebar-non-existant: #5c6773;
--sidebar-active: #ffb454;
--sidebar-spacer: #2d334f;
--scrollbar: var(--sidebar-fg);
--icons: #737480;
--icons-hover: #b7b9cc;
--links: #0096cf;
--inline-code-color: #ffb454;
--theme-popup-bg: #14191f;
--theme-popup-border: #5c6773;
--theme-hover: #191f26;
--quote-bg: hsl(226, 15%, 17%);
--quote-border: hsl(226, 15%, 22%);
--warning-border: #ff8e00;
--table-border-color: hsl(210, 25%, 13%);
--table-header-bg: hsl(210, 25%, 28%);
--table-alternate-bg: hsl(210, 25%, 11%);
--searchbar-border-color: #848484;
--searchbar-bg: #424242;
--searchbar-fg: #fff;
--searchbar-shadow-color: #d4c89f;
--searchresults-header-fg: #666;
--searchresults-border-color: #888;
--searchresults-li-bg: #252932;
--search-mark-bg: #e3b171;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(45%) sepia(6%) saturate(621%) hue-rotate(198deg) brightness(99%) contrast(85%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(68%) sepia(55%) saturate(531%) hue-rotate(341deg) brightness(104%) contrast(101%);
--footnote-highlight: #2668a6;
--overlay-bg: rgba(33, 40, 48, 0.4);
--blockquote-note-color: #74b9ff;
--blockquote-tip-color: #09ca09;
--blockquote-important-color: #d3abff;
--blockquote-warning-color: #f0b72f;
--blockquote-caution-color: #f21424;
--sidebar-header-border-color: #c18639;
}
.coal {
--bg: hsl(200, 7%, 8%);
--fg: #98a3ad;
--sidebar-bg: #292c2f;
--sidebar-fg: #a1adb8;
--sidebar-non-existant: #505254;
--sidebar-active: #3473ad;
--sidebar-spacer: #393939;
--scrollbar: var(--sidebar-fg);
--icons: #43484d;
--icons-hover: #b3c0cc;
--links: #2b79a2;
--inline-code-color: #c5c8c6;
--theme-popup-bg: #141617;
--theme-popup-border: #43484d;
--theme-hover: #1f2124;
--quote-bg: hsl(234, 21%, 18%);
--quote-border: hsl(234, 21%, 23%);
--warning-border: #ff8e00;
--table-border-color: hsl(200, 7%, 13%);
--table-header-bg: hsl(200, 7%, 28%);
--table-alternate-bg: hsl(200, 7%, 11%);
--searchbar-border-color: #aaa;
--searchbar-bg: #b7b7b7;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #98a3ad;
--searchresults-li-bg: #2b2b2f;
--search-mark-bg: #355c7d;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(26%) sepia(8%) saturate(575%) hue-rotate(169deg) brightness(87%) contrast(82%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(36%) sepia(70%) saturate(503%) hue-rotate(167deg) brightness(98%) contrast(89%);
--footnote-highlight: #4079ae;
--overlay-bg: rgba(33, 40, 48, 0.4);
--blockquote-note-color: #4493f8;
--blockquote-tip-color: #08ae08;
--blockquote-important-color: #ab7df8;
--blockquote-warning-color: #d29922;
--blockquote-caution-color: #d91b29;
--sidebar-header-border-color: #3473ad;
}
.light, html:not(.js) {
--bg: hsl(0, 0%, 100%);
--fg: hsl(0, 0%, 0%);
--sidebar-bg: #fafafa;
--sidebar-fg: hsl(0, 0%, 0%);
--sidebar-non-existant: #aaaaaa;
--sidebar-active: #1f1fff;
--sidebar-spacer: #f4f4f4;
--scrollbar: #8F8F8F;
--icons: #747474;
--icons-hover: #000000;
--links: #20609f;
--inline-code-color: #301900;
--theme-popup-bg: #fafafa;
--theme-popup-border: #cccccc;
--theme-hover: #e6e6e6;
--quote-bg: hsl(197, 37%, 96%);
--quote-border: hsl(197, 37%, 91%);
--warning-border: #ff8e00;
--table-border-color: hsl(0, 0%, 95%);
--table-header-bg: hsl(0, 0%, 80%);
--table-alternate-bg: hsl(0, 0%, 97%);
--searchbar-border-color: #aaa;
--searchbar-bg: #fafafa;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #888;
--searchresults-li-bg: #e4f2fe;
--search-mark-bg: #a2cff5;
--color-scheme: light;
/* Same as `--icons` */
--copy-button-filter: invert(45.49%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(14%) sepia(93%) saturate(4250%) hue-rotate(243deg) brightness(99%) contrast(130%);
--footnote-highlight: #7e7eff;
--overlay-bg: rgba(200, 200, 205, 0.4);
--blockquote-note-color: #0969da;
--blockquote-tip-color: #008000;
--blockquote-important-color: #8250df;
--blockquote-warning-color: #9a6700;
--blockquote-caution-color: #b52731;
--sidebar-header-border-color: #6e6edb;
}
.navy {
--bg: hsl(226, 23%, 11%);
--fg: #bcbdd0;
--sidebar-bg: #282d3f;
--sidebar-fg: #c8c9db;
--sidebar-non-existant: #505274;
--sidebar-active: #2b79a2;
--sidebar-spacer: #2d334f;
--scrollbar: var(--sidebar-fg);
--icons: #737480;
--icons-hover: #b7b9cc;
--links: #2b79a2;
--inline-code-color: #c5c8c6;
--theme-popup-bg: #161923;
--theme-popup-border: #737480;
--theme-hover: #282e40;
--quote-bg: hsl(226, 15%, 17%);
--quote-border: hsl(226, 15%, 22%);
--warning-border: #ff8e00;
--table-border-color: hsl(226, 23%, 16%);
--table-header-bg: hsl(226, 23%, 31%);
--table-alternate-bg: hsl(226, 23%, 14%);
--searchbar-border-color: #aaa;
--searchbar-bg: #aeaec6;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #5f5f71;
--searchresults-border-color: #5c5c68;
--searchresults-li-bg: #242430;
--search-mark-bg: #a2cff5;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(51%) sepia(10%) saturate(393%) hue-rotate(198deg) brightness(86%) contrast(87%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(46%) sepia(20%) saturate(1537%) hue-rotate(156deg) brightness(85%) contrast(90%);
--footnote-highlight: #4079ae;
--overlay-bg: rgba(33, 40, 48, 0.4);
--blockquote-note-color: #4493f8;
--blockquote-tip-color: #09ca09;
--blockquote-important-color: #ab7df8;
--blockquote-warning-color: #d29922;
--blockquote-caution-color: #f21424;
--sidebar-header-border-color: #2f6ab5;
}
.rust {
--bg: hsl(60, 9%, 87%);
--fg: #262625;
--sidebar-bg: #3b2e2a;
--sidebar-fg: #c8c9db;
--sidebar-non-existant: #505254;
--sidebar-active: #e69f67;
--sidebar-spacer: #45373a;
--scrollbar: var(--sidebar-fg);
--icons: #737480;
--icons-hover: #262625;
--links: #2b79a2;
--inline-code-color: #6e6b5e;
--theme-popup-bg: #e1e1db;
--theme-popup-border: #b38f6b;
--theme-hover: #99908a;
--quote-bg: hsl(60, 5%, 75%);
--quote-border: hsl(60, 5%, 70%);
--warning-border: #ff8e00;
--table-border-color: hsl(60, 9%, 82%);
--table-header-bg: #b3a497;
--table-alternate-bg: hsl(60, 9%, 84%);
--searchbar-border-color: #aaa;
--searchbar-bg: #fafafa;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #888;
--searchresults-li-bg: #dec2a2;
--search-mark-bg: #e69f67;
/* Same as `--icons` */
--copy-button-filter: invert(51%) sepia(10%) saturate(393%) hue-rotate(198deg) brightness(86%) contrast(87%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(77%) sepia(16%) saturate(1798%) hue-rotate(328deg) brightness(98%) contrast(83%);
--footnote-highlight: #d3a17a;
--overlay-bg: rgba(150, 150, 150, 0.25);
--blockquote-note-color: #023b95;
--blockquote-tip-color: #007700;
--blockquote-important-color: #8250df;
--blockquote-warning-color: #603700;
--blockquote-caution-color: #aa1721;
--sidebar-header-border-color: #8c391f;
}
@media (prefers-color-scheme: dark) {
html:not(.js) {
--bg: hsl(200, 7%, 8%);
--fg: #98a3ad;
--sidebar-bg: #292c2f;
--sidebar-fg: #a1adb8;
--sidebar-non-existant: #505254;
--sidebar-active: #3473ad;
--sidebar-spacer: #393939;
--scrollbar: var(--sidebar-fg);
--icons: #43484d;
--icons-hover: #b3c0cc;
--links: #2b79a2;
--inline-code-color: #c5c8c6;
--theme-popup-bg: #141617;
--theme-popup-border: #43484d;
--theme-hover: #1f2124;
--quote-bg: hsl(234, 21%, 18%);
--quote-border: hsl(234, 21%, 23%);
--warning-border: #ff8e00;
--table-border-color: hsl(200, 7%, 13%);
--table-header-bg: hsl(200, 7%, 28%);
--table-alternate-bg: hsl(200, 7%, 11%);
--searchbar-border-color: #aaa;
--searchbar-bg: #b7b7b7;
--searchbar-fg: #000;
--searchbar-shadow-color: #aaa;
--searchresults-header-fg: #666;
--searchresults-border-color: #98a3ad;
--searchresults-li-bg: #2b2b2f;
--search-mark-bg: #355c7d;
--color-scheme: dark;
/* Same as `--icons` */
--copy-button-filter: invert(26%) sepia(8%) saturate(575%) hue-rotate(169deg) brightness(87%) contrast(82%);
/* Same as `--sidebar-active` */
--copy-button-filter-hover: invert(36%) sepia(70%) saturate(503%) hue-rotate(167deg) brightness(98%) contrast(89%);
--footnote-highlight: #4079ae;
--overlay-bg: rgba(33, 40, 48, 0.4);
--blockquote-note-color: #4493f8;
--blockquote-tip-color: #08ae08;
--blockquote-important-color: #ab7df8;
--blockquote-warning-color: #d29922;
--blockquote-caution-color: #d91b29;
--sidebar-header-border-color: #3473ad;
}
}

300
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<!DOCTYPE HTML>
<html lang="en" class="navy sidebar-visible" dir="ltr">
<head>
<!-- Book generated using mdBook -->
<meta charset="UTF-8">
<title>Downloading - yt-offline</title>
<!-- Custom HTML head -->
<meta name="description" content="Self-hosted archive for YouTube, TikTok, Twitch and more. Setup, usage, anti-bot, troubleshooting, and architecture.">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#ffffff">
<link rel="icon" href="favicon-de23e50b.svg">
<link rel="shortcut icon" href="favicon-8114d1fc.png">
<link rel="stylesheet" href="css/variables-8adf115d.css">
<link rel="stylesheet" href="css/general-0392ca55.css">
<link rel="stylesheet" href="css/chrome-fc474251.css">
<link rel="stylesheet" href="css/print-9e4910d8.css" media="print">
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<link rel="stylesheet" href="fonts/fonts-9644e21d.css">
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<link rel="stylesheet" id="mdbook-highlight-css" href="highlight-493f70e1.css">
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<script>
const path_to_root = "";
const default_light_theme = "navy";
const default_dark_theme = "navy";
window.path_to_searchindex_js = "searchindex-4723df7c.js";
</script>
<!-- Start loading toc.js asap -->
<script src="toc-0334b8fe.js"></script>
</head>
<body>
<div id="mdbook-help-container">
<div id="mdbook-help-popup">
<h2 class="mdbook-help-title">Keyboard shortcuts</h2>
<div>
<p>Press <kbd>←</kbd> or <kbd>→</kbd> to navigate between chapters</p>
<p>Press <kbd>S</kbd> or <kbd>/</kbd> to search in the book</p>
<p>Press <kbd>?</kbd> to show this help</p>
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</div>
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<script>
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let theme = localStorage.getItem('mdbook-theme');
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if (theme.startsWith('"') && theme.endsWith('"')) {
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
}
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if (theme === null || theme === undefined) { theme = default_theme; }
const html = document.documentElement;
html.classList.remove('navy')
html.classList.add(theme);
html.classList.add("js");
</script>
<input type="checkbox" id="mdbook-sidebar-toggle-anchor" class="hidden">
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} else {
html.classList.remove('sidebar-visible');
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</script>
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<div class="page">
<div id="mdbook-menu-bar-hover-placeholder"></div>
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<h1 class="menu-title">yt-offline</h1>
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<h1 id="downloading"><a class="header" href="#downloading">Downloading</a></h1>
<h2 id="starting-a-download"><a class="header" href="#starting-a-download">Starting a download</a></h2>
<p>Paste any supported URL into the download bar (desktop) or the ⬇
Downloads modal (web). yt-offline classifies the URL by platform, routes
it to the right folder, and starts yt-dlp. A channel/playlist URL pulls
the whole thing; a single-video URL pulls just that one.</p>
<p><strong>Quality picker:</strong> Best / 1080p / 720p / 480p / 360p, or <strong>Music mode</strong>
for audio-only extraction into <code>music/&lt;artist&gt;/</code>.</p>
<p><strong>Fast mode</strong> stops at the first already-downloaded video (quick routine
re-checks). Turn it off for a full gap-filling scan.</p>
<h2 id="per-channel-options"><a class="header" href="#per-channel-options">Per-channel options</a></h2>
<p>Right-click a channel (or use the ⚙ on its sidebar row) for overrides
that apply to scheduled re-checks and the “Check for new videos” action:</p>
<ul>
<li>Quality cap, audio-only, bandwidth cap, min/max file size, date cutoff.</li>
<li>A free-form <code>--match-filter</code> (e.g. <code>duration &gt; 60 &amp; view_count &gt; 100</code>).</li>
<li>Subtitle overrides, YouTube player-client override, post-download
convert mode — each defaulting to the global setting.</li>
<li><strong>Skip auth check</strong> — silences yt-dlp’s “playlists that require
authentication” warning for <strong>public</strong> channels (see
<a href="./troubleshooting.html#the-youtubetab-authentication-warning">Troubleshooting</a>).</li>
</ul>
<p>Per-channel options ride along in library backup/restore.</p>
<h2 id="subtitles"><a class="header" href="#subtitles">Subtitles</a></h2>
<p>Global defaults (Settings → Subtitles) + per-channel overrides control:
download on/off, auto-generated captions, embedding into the container,
language filter, and format conversion (<code>srt</code> is the most
Plex/player-compatible). Subtitles are written as sidecar files and
optionally embedded.</p>
<h2 id="format-conversion"><a class="header" href="#format-conversion">Format conversion</a></h2>
<p>A post-download ffmpeg pass (Settings → Format conversion, or per
channel):</p>
<ul>
<li><strong>Remux → mp4</strong> — instant container change, no re-encode (device/Plex
compatibility).</li>
<li><strong>Re-encode → H.264 mp4</strong> — shrink large 4K files at a chosen CRF +
x264 preset.</li>
<li><strong>Extract audio</strong> — mp3 / m4a / opus / flac.</li>
</ul>
<p>It runs as a distinct transcode job after the download. <strong>Keep original</strong>
preserves <code>&lt;name&gt;.original.&lt;ext&gt;</code> alongside the converted file; otherwise
the source is removed once the convert succeeds.</p>
<h2 id="resilience"><a class="header" href="#resilience">Resilience</a></h2>
<p>Downloads are hardened against YouTube’s flakiness automatically:</p>
<ul>
<li><strong>Retry + backoff</strong> on connection resets (<code>--retries 30</code>, linear
retry-sleep).</li>
<li><strong>Jittered throttle</strong> between videos so a long channel scan doesn’t
look robotic and trip the captcha wall.</li>
<li><strong>Auto-retry</strong> of transient (rate-limit / network / captcha) failures
after a cooldown, with adaptive slow-down for the rest of the batch.</li>
<li><strong>Hang watchdog</strong> kills a job that produces no output for 5 minutes (a
wedged request) and re-queues it.</li>
</ul>
<p>Failures are classified and shown with a one-line suggested fix — see
<a href="./troubleshooting.html">Troubleshooting</a>.</p>
<h2 id="scheduler"><a class="header" href="#scheduler">Scheduler</a></h2>
<p>Enable it (Settings → Auto-check channels) to re-check every channel for
new uploads on an interval. Each channel uses its own stored options.
There’s also a per-folder “Check all” action.</p>
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<h1 id="first-run--configuration"><a class="header" href="#first-run--configuration">First run &amp; configuration</a></h1>
<h2 id="the-config-file"><a class="header" href="#the-config-file">The config file</a></h2>
<p>yt-offline reads <code>config.toml</code> <strong>from its working directory</strong> (the
directory you launch it from), not a fixed path. The same goes for
<code>cookies.txt</code>. Everything in <code>config.toml</code> is also editable in Settings;
edits there are written back to the file.</p>
<pre><code class="language-toml">[backup]
directory = "/path/to/library" # the umbrella dir; all platforms nest under it
max_concurrent = 3 # parallel yt-dlp processes
use_bundled_ytdlp = false # true = use the managed venv (see below)
use_pot_provider = false # YouTube Proof-of-Origin tokens (see Anti-bot)
youtube_player_clients = "" # e.g. "tv,mweb" to route around captchas
[player]
command = "mpv" # any executable taking a file path as its last arg
browser = "firefox" # cookie source when no cookies.txt is set (see Anti-bot)
[ui]
theme = "dark" # dark | light | dracula | trans | emo-nocturnal | emo-coffin | emo-scene-queen
ui_scale = 1.0 # global zoom for the whole desktop UI
[scheduler]
enabled = false
interval_hours = 24 # auto re-check every channel for new uploads
[web]
port = 8080
bind = "127.0.0.1" # 127.0.0.1 | 0.0.0.0 | a Tailscale/LAN address
transcode = false # MKV → MP4 on the fly for browsers that can't decode MKV
[subtitles]
enabled = true
auto_generated = true # include machine captions
embed = false # also embed into the container
format = "" # "" = native; "srt" for Plex compatibility
langs = "" # "" = all; "en" or "en,ja" to filter
[convert]
mode = "" # "" / "remux-mp4" / "h264-mp4" / "audio"
crf = 23 # for h264-mp4 (lower = bigger/better)
preset = "medium"
audio_format = "mp3" # for audio mode
keep_original = false # keep &lt;name&gt;.original.&lt;ext&gt; after converting
[plex]
library_path = "/path/to/plex/TV/youtube" # leave unset to disable
</code></pre>
<h2 id="the-library-layout"><a class="header" href="#the-library-layout">The library layout</a></h2>
<p>Everything nests under the one <code>backup.directory</code>:</p>
<pre><code class="language-text">&lt;backup.directory&gt;/
channels/ ← YouTube creators
tiktok/ twitch/ vimeo/ bandcamp/ soundcloud/ odysee/ other/
music/ ← audio-only "Music mode" downloads, by artist
archive.txt ← yt-dlp's global download archive
cookies.txt ← optional, if you set one
yt-offline.db ← watched/positions/flags/folders/notes/cache + password hash
</code></pre>
<p>Each creator folder gets a hidden <code>.source-url</code> sidecar so re-checks
always know the exact URL to refresh from.</p>
<h2 id="bundled-vs-system-yt-dlp"><a class="header" href="#bundled-vs-system-yt-dlp">Bundled vs system yt-dlp</a></h2>
<p>In <strong>Settings → yt-dlp binary</strong> you choose:</p>
<ul>
<li><strong>System</strong> — uses whatever <code>yt-dlp</code> is on your <code>PATH</code>.</li>
<li><strong>Bundled</strong> — click <strong>Install</strong> and yt-offline builds a self-contained
venv at <code>~/.local/share/yt-offline/</code>: nightly <code>yt-dlp[default]</code> +
<code>curl_cffi</code> (TLS impersonation) + a bundled <code>deno</code> (player-JS). The
same button updates it later.</li>
</ul>
<p>The bundled path is recommended — it installs <strong>nightly</strong> yt-dlp, which
keeps pace with YouTube’s frequent anti-bot changes (stable lags). It’s
also required for the <a href="./anti-bot.html#3-pot-tokens-proof-of-origin">POT token provider</a>.</p>
<h2 id="the-two-front-ends"><a class="header" href="#the-two-front-ends">The two front-ends</a></h2>
<ul>
<li><code>yt-offline</code> — desktop GUI (eframe/egui).</li>
<li><code>yt-offline --web [PORT]</code> — headless web server. Bind to <code>127.0.0.1</code>
(default) for localhost-only, a Tailscale address for your tailnet, or
<code>0.0.0.0</code> for the LAN. <strong>Set a password</strong> (Settings) before exposing it
beyond localhost — the UI and all <code>/api</code> routes are then gated behind an
Argon2-hashed, rate-limited login.</li>
</ul>
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Copyright 2010, 2012 Adobe Systems Incorporated (http://www.adobe.com/), with Reserved Font Name 'Source'. All Rights Reserved. Source is a trademark of Adobe Systems Incorporated in the United States and/or other countries.
This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
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-----------------------------------------------------------
SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
-----------------------------------------------------------
PREAMBLE
The goals of the Open Font License (OFL) are to stimulate worldwide
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DEFINITIONS
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"Author" refers to any designer, engineer, programmer, technical
writer or other person who contributed to the Font Software.
PERMISSION & CONDITIONS
Permission is hereby granted, free of charge, to any person obtaining
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Software, subject to the following conditions:
1) Neither the Font Software nor any of its individual components,
in Original or Modified Versions, may be sold by itself.
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3) No Modified Version of the Font Software may use the Reserved Font
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/* Open Sans is licensed under the Apache License, Version 2.0. See http://www.apache.org/licenses/LICENSE-2.0 */
/* Source Code Pro is under the Open Font License. See https://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=OFL */
/* open-sans-300 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: normal;
font-weight: 300;
src: local('Open Sans Light'), local('OpenSans-Light'),
url('../fonts/open-sans-v17-all-charsets-300-7736aa35.woff2') format('woff2');
}
/* open-sans-300italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: italic;
font-weight: 300;
src: local('Open Sans Light Italic'), local('OpenSans-LightItalic'),
url('../fonts/open-sans-v17-all-charsets-300italic-2c7b95c0.woff2') format('woff2');
}
/* open-sans-regular - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: normal;
font-weight: 400;
src: local('Open Sans Regular'), local('OpenSans-Regular'),
url('../fonts/open-sans-v17-all-charsets-regular-2e3b1d34.woff2') format('woff2');
}
/* open-sans-italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: italic;
font-weight: 400;
src: local('Open Sans Italic'), local('OpenSans-Italic'),
url('../fonts/open-sans-v17-all-charsets-italic-6c9463f7.woff2') format('woff2');
}
/* open-sans-600 - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: normal;
font-weight: 600;
src: local('Open Sans SemiBold'), local('OpenSans-SemiBold'),
url('../fonts/open-sans-v17-all-charsets-600-486c6759.woff2') format('woff2');
}
/* open-sans-600italic - latin_vietnamese_latin-ext_greek-ext_greek_cyrillic-ext_cyrillic */
@font-face {
font-family: 'Open Sans';
font-style: italic;
font-weight: 600;
src: local('Open Sans SemiBold Italic'), local('OpenSans-SemiBoldItalic'),
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<h1 id="yt-offline"><a class="header" href="#yt-offline">yt-offline</a></h1>
<p>A self-hosted media archive for YouTube and friends. Paste any URL, it
routes the download to the right folder by source, tracks what you’ve
watched, and plays everything back from a desktop GUI <strong>or</strong> a browser —
even offline, or after the source video is taken down.</p>
<p>Built on <a href="https://github.com/yt-dlp/yt-dlp">yt-dlp</a>; written in Rust as a
single binary that is <strong>both</strong> a desktop app and a headless web server.</p>
<h2 id="what-it-backs-up"><a class="header" href="#what-it-backs-up">What it backs up</a></h2>
<div class="table-wrapper">
<table>
<thead>
<tr><th>Platform</th><th>Channels</th><th>Playlists</th><th>Single videos</th></tr>
</thead>
<tbody>
<tr><td>YouTube</td><td>✅</td><td>✅</td><td>✅</td></tr>
<tr><td>TikTok</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Twitch (VODs + clips)</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Vimeo</td><td>✅</td><td>✅</td><td>✅</td></tr>
<tr><td>Bandcamp</td><td>✅ (artist)</td><td>✅ (albums)</td><td>✅ (tracks)</td></tr>
<tr><td>SoundCloud</td><td>✅</td><td>✅ (sets)</td><td>✅</td></tr>
<tr><td>Odysee</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Anything else yt-dlp accepts</td><td><code>other/</code></td><td><code>other/</code></td><td><code>other/</code></td></tr>
</tbody>
</table>
</div>
<h2 id="why-it-exists"><a class="header" href="#why-it-exists">Why it exists</a></h2>
<p>Tartube is the mature open-source yt-dlp GUI and the benchmark in this
space. yt-offline matches its feature set while adding things Tartube
doesn’t have: a real web UI reachable from any device, a single-binary
distribution with a bundled toolchain, a modern security model
(password-gated UI, Argon2, rate-limited login), a built-in anti-bot
stack (TLS impersonation + Proof-of-Origin tokens), and one-click
post-download format conversion.</p>
<h2 id="how-to-read-these-docs"><a class="header" href="#how-to-read-these-docs">How to read these docs</a></h2>
<ul>
<li>New here? <strong><a href="./installation.html">Installation</a></strong> →
<strong><a href="./first-run.html">First run</a></strong> → <strong><a href="./downloading.html">Downloading</a></strong>.</li>
<li>Hitting captchas or “Video unavailable”? Go straight to
<strong><a href="./anti-bot.html">Anti-bot</a></strong> and <strong><a href="./troubleshooting.html">Troubleshooting</a></strong>.</li>
<li>Hacking on it? <strong><a href="./architecture.html">Architecture</a></strong>.</li>
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<h1 id="installation"><a class="header" href="#installation">Installation</a></h1>
<p>yt-offline is a single Rust binary. You can install a prebuilt package,
build from source, or grab the AppImage.</p>
<h2 id="runtime-dependencies"><a class="header" href="#runtime-dependencies">Runtime dependencies</a></h2>
<p>Whichever way you install, these are invoked as subprocesses at runtime:</p>
<ul>
<li><strong>yt-dlp</strong> — the download engine. You can use the system one <em>or</em> let
yt-offline manage a bundled copy (see <a href="./first-run.html">First run</a>).</li>
<li><strong>ffmpeg</strong> — muxing, format conversion, on-the-fly transcode for the
web player.</li>
<li><strong>mpv</strong> — the default desktop player (any player taking a file path
works; set it in Settings).</li>
<li><strong>xdg-utils</strong> — <code>xdg-open</code> for “Show in file manager”.</li>
</ul>
<h2 id="prebuilt-packages-linux"><a class="header" href="#prebuilt-packages-linux">Prebuilt packages (Linux)</a></h2>
<p>Releases attach <code>.deb</code>, <code>.rpm</code>, and <code>.AppImage</code> artifacts.</p>
<pre><code class="language-sh"># Debian / Ubuntu / Mint
sudo apt install ./yt-offline_*_amd64.deb
# Fedora / RHEL / openSUSE (ffmpeg via RPM Fusion)
sudo dnf install ./yt-offline-*.x86_64.rpm
# Any Linux — AppImage
chmod +x yt-offline-*-x86_64.AppImage
./yt-offline-*-x86_64.AppImage
</code></pre>
<h2 id="arch--cachyos--manjaro"><a class="header" href="#arch--cachyos--manjaro">Arch / CachyOS / Manjaro</a></h2>
<p>A <code>PKGBUILD</code> ships in the repo root. Build it from a <strong>clean</strong> directory:</p>
<pre><code class="language-sh">mkdir build &amp;&amp; cd build
cp /path/to/repo/PKGBUILD .
makepkg -si
</code></pre>
<p>For repeated builds after pulling new commits, always pass <code>-C</code>
(cleanbuild) so makepkg re-checks out the latest source instead of
reusing a stale cached clone.</p>
<h2 id="from-source"><a class="header" href="#from-source">From source</a></h2>
<pre><code class="language-sh"># Debian/Ubuntu build deps
sudo apt install build-essential pkg-config curl git python3-venv \
libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev \
libxkbcommon-dev libssl-dev
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
source "$HOME/.cargo/env"
git clone https://codeberg.org/anassaeneroi/yt-offline
cd yt-offline
cargo build --release
./target/release/yt-offline # desktop GUI
./target/release/yt-offline --web 8080 # headless web server
</code></pre>
<p><code>python3-venv</code> is only needed for the bundled-yt-dlp install path; skip
it if you’ll always use system yt-dlp.</p>
<h2 id="windows--macos"><a class="header" href="#windows--macos">Windows / macOS</a></h2>
<p>Not first-class yet. The Linux-only system tray (<code>ksni</code>) and file dialog
(<code>rfd</code> xdg-portal) need per-OS backends before a clean cross-build; the
rest of the stack already compiles. See the
<a href="./architecture.html#platform-support">architecture notes</a>.</p>
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<h1 id="yt-offline"><a class="header" href="#yt-offline">yt-offline</a></h1>
<p>A self-hosted media archive for YouTube and friends. Paste any URL, it
routes the download to the right folder by source, tracks what you’ve
watched, and plays everything back from a desktop GUI <strong>or</strong> a browser —
even offline, or after the source video is taken down.</p>
<p>Built on <a href="https://github.com/yt-dlp/yt-dlp">yt-dlp</a>; written in Rust as a
single binary that is <strong>both</strong> a desktop app and a headless web server.</p>
<h2 id="what-it-backs-up"><a class="header" href="#what-it-backs-up">What it backs up</a></h2>
<div class="table-wrapper">
<table>
<thead>
<tr><th>Platform</th><th>Channels</th><th>Playlists</th><th>Single videos</th></tr>
</thead>
<tbody>
<tr><td>YouTube</td><td>✅</td><td>✅</td><td>✅</td></tr>
<tr><td>TikTok</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Twitch (VODs + clips)</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Vimeo</td><td>✅</td><td>✅</td><td>✅</td></tr>
<tr><td>Bandcamp</td><td>✅ (artist)</td><td>✅ (albums)</td><td>✅ (tracks)</td></tr>
<tr><td>SoundCloud</td><td>✅</td><td>✅ (sets)</td><td>✅</td></tr>
<tr><td>Odysee</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Anything else yt-dlp accepts</td><td><code>other/</code></td><td><code>other/</code></td><td><code>other/</code></td></tr>
</tbody>
</table>
</div>
<h2 id="why-it-exists"><a class="header" href="#why-it-exists">Why it exists</a></h2>
<p>Tartube is the mature open-source yt-dlp GUI and the benchmark in this
space. yt-offline matches its feature set while adding things Tartube
doesn’t have: a real web UI reachable from any device, a single-binary
distribution with a bundled toolchain, a modern security model
(password-gated UI, Argon2, rate-limited login), a built-in anti-bot
stack (TLS impersonation + Proof-of-Origin tokens), and one-click
post-download format conversion.</p>
<h2 id="how-to-read-these-docs"><a class="header" href="#how-to-read-these-docs">How to read these docs</a></h2>
<ul>
<li>New here? <strong><a href="./installation.html">Installation</a></strong> →
<strong><a href="./first-run.html">First run</a></strong> → <strong><a href="./downloading.html">Downloading</a></strong>.</li>
<li>Hitting captchas or “Video unavailable”? Go straight to
<strong><a href="./anti-bot.html">Anti-bot</a></strong> and <strong><a href="./troubleshooting.html">Troubleshooting</a></strong>.</li>
<li>Hacking on it? <strong><a href="./architecture.html">Architecture</a></strong>.</li>
</ul>
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<h1 class="menu-title">yt-offline</h1>
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<h1 id="packaging"><a class="header" href="#packaging">Packaging</a></h1>
<p>Build distributable Linux packages with one script:</p>
<pre><code class="language-sh">scripts/package.sh all # .deb + .rpm + .AppImage → dist/
scripts/package.sh deb # just the .deb
scripts/package.sh rpm
scripts/package.sh appimage
</code></pre>
<p>It builds the release binary once and reuses it for every format,
installing <code>cargo-deb</code> / <code>cargo-generate-rpm</code> on demand and downloading
<code>appimagetool</code> to <code>dist/tools/</code> on first AppImage build. Per-format
failures are isolated and summarized at the end. Output (gitignored)
lands in <code>dist/</code>.</p>
<h2 id="formats"><a class="header" href="#formats">Formats</a></h2>
<ul>
<li><strong><code>.deb</code></strong> — built by <a href="https://github.com/kornelski/cargo-deb">cargo-deb</a>
from <code>[package.metadata.deb]</code> in <code>Cargo.toml</code>.</li>
<li><strong><code>.rpm</code></strong> — built by
<a href="https://github.com/cat-in-136/cargo-generate-rpm">cargo-generate-rpm</a>
from <code>[package.metadata.generate-rpm]</code>. (<code>ffmpeg</code> on Fedora is in
RPM Fusion.)</li>
<li><strong>AppImage</strong> — a hand-rolled AppDir + appimagetool. Bundles the GUI
binary’s shared-library closure only; <code>yt-dlp</code>/<code>ffmpeg</code>/<code>mpv</code> stay host
PATH deps, same as the package declarations.</li>
<li><strong>Arch</strong> — use the repo’s <code>PKGBUILD</code> (not this script); run <code>makepkg</code>
from a clean directory.</li>
</ul>
<h2 id="ci"><a class="header" href="#ci">CI</a></h2>
<p>The repo ships <code>.forgejo/workflows/</code> definitions (<code>test.yml</code>,
<code>release.yml</code>), but Codeberg executes Woodpecker rather than Forgejo
Actions — so they don’t run there without a self-hosted runner. Until
then, build packages locally with <code>scripts/package.sh</code> and publish docs
with <code>scripts/publish-docs.sh</code>.</p>
<p>The repo’s <a href="https://codeberg.org/anassaeneroi/yt-offline/src/branch/main/docs/PACKAGING.md"><code>docs/PACKAGING.md</code></a>
has the per-distro install commands and the Windows/macOS status in full.</p>
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<h1 id="yt-offline"><a class="header" href="#yt-offline">yt-offline</a></h1>
<p>A self-hosted media archive for YouTube and friends. Paste any URL, it
routes the download to the right folder by source, tracks what you’ve
watched, and plays everything back from a desktop GUI <strong>or</strong> a browser —
even offline, or after the source video is taken down.</p>
<p>Built on <a href="https://github.com/yt-dlp/yt-dlp">yt-dlp</a>; written in Rust as a
single binary that is <strong>both</strong> a desktop app and a headless web server.</p>
<h2 id="what-it-backs-up"><a class="header" href="#what-it-backs-up">What it backs up</a></h2>
<div class="table-wrapper">
<table>
<thead>
<tr><th>Platform</th><th>Channels</th><th>Playlists</th><th>Single videos</th></tr>
</thead>
<tbody>
<tr><td>YouTube</td><td>✅</td><td>✅</td><td>✅</td></tr>
<tr><td>TikTok</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Twitch (VODs + clips)</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Vimeo</td><td>✅</td><td>✅</td><td>✅</td></tr>
<tr><td>Bandcamp</td><td>✅ (artist)</td><td>✅ (albums)</td><td>✅ (tracks)</td></tr>
<tr><td>SoundCloud</td><td>✅</td><td>✅ (sets)</td><td>✅</td></tr>
<tr><td>Odysee</td><td>✅</td><td>—</td><td>✅</td></tr>
<tr><td>Anything else yt-dlp accepts</td><td><code>other/</code></td><td><code>other/</code></td><td><code>other/</code></td></tr>
</tbody>
</table>
</div>
<h2 id="why-it-exists"><a class="header" href="#why-it-exists">Why it exists</a></h2>
<p>Tartube is the mature open-source yt-dlp GUI and the benchmark in this
space. yt-offline matches its feature set while adding things Tartube
doesn’t have: a real web UI reachable from any device, a single-binary
distribution with a bundled toolchain, a modern security model
(password-gated UI, Argon2, rate-limited login), a built-in anti-bot
stack (TLS impersonation + Proof-of-Origin tokens), and one-click
post-download format conversion.</p>
<h2 id="how-to-read-these-docs"><a class="header" href="#how-to-read-these-docs">How to read these docs</a></h2>
<ul>
<li>New here? <strong><a href="#installation">Installation</a></strong> →
<strong><a href="#first-run--configuration">First run</a></strong> → <strong><a href="#downloading">Downloading</a></strong>.</li>
<li>Hitting captchas or “Video unavailable”? Go straight to
<strong><a href="#staying-ahead-of-youtubes-bot-detection">Anti-bot</a></strong> and <strong><a href="#troubleshooting">Troubleshooting</a></strong>.</li>
<li>Hacking on it? <strong><a href="#architecture">Architecture</a></strong>.</li>
</ul>
<div style="break-before: page; page-break-before: always;"></div>
<h1 id="installation"><a class="header" href="#installation">Installation</a></h1>
<p>yt-offline is a single Rust binary. You can install a prebuilt package,
build from source, or grab the AppImage.</p>
<h2 id="runtime-dependencies"><a class="header" href="#runtime-dependencies">Runtime dependencies</a></h2>
<p>Whichever way you install, these are invoked as subprocesses at runtime:</p>
<ul>
<li><strong>yt-dlp</strong> — the download engine. You can use the system one <em>or</em> let
yt-offline manage a bundled copy (see <a href="#first-run--configuration">First run</a>).</li>
<li><strong>ffmpeg</strong> — muxing, format conversion, on-the-fly transcode for the
web player.</li>
<li><strong>mpv</strong> — the default desktop player (any player taking a file path
works; set it in Settings).</li>
<li><strong>xdg-utils</strong> — <code>xdg-open</code> for “Show in file manager”.</li>
</ul>
<h2 id="prebuilt-packages-linux"><a class="header" href="#prebuilt-packages-linux">Prebuilt packages (Linux)</a></h2>
<p>Releases attach <code>.deb</code>, <code>.rpm</code>, and <code>.AppImage</code> artifacts.</p>
<pre><code class="language-sh"># Debian / Ubuntu / Mint
sudo apt install ./yt-offline_*_amd64.deb
# Fedora / RHEL / openSUSE (ffmpeg via RPM Fusion)
sudo dnf install ./yt-offline-*.x86_64.rpm
# Any Linux — AppImage
chmod +x yt-offline-*-x86_64.AppImage
./yt-offline-*-x86_64.AppImage
</code></pre>
<h2 id="arch--cachyos--manjaro"><a class="header" href="#arch--cachyos--manjaro">Arch / CachyOS / Manjaro</a></h2>
<p>A <code>PKGBUILD</code> ships in the repo root. Build it from a <strong>clean</strong> directory:</p>
<pre><code class="language-sh">mkdir build &amp;&amp; cd build
cp /path/to/repo/PKGBUILD .
makepkg -si
</code></pre>
<p>For repeated builds after pulling new commits, always pass <code>-C</code>
(cleanbuild) so makepkg re-checks out the latest source instead of
reusing a stale cached clone.</p>
<h2 id="from-source"><a class="header" href="#from-source">From source</a></h2>
<pre><code class="language-sh"># Debian/Ubuntu build deps
sudo apt install build-essential pkg-config curl git python3-venv \
libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev \
libxkbcommon-dev libssl-dev
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
source "$HOME/.cargo/env"
git clone https://codeberg.org/anassaeneroi/yt-offline
cd yt-offline
cargo build --release
./target/release/yt-offline # desktop GUI
./target/release/yt-offline --web 8080 # headless web server
</code></pre>
<p><code>python3-venv</code> is only needed for the bundled-yt-dlp install path; skip
it if you’ll always use system yt-dlp.</p>
<h2 id="windows--macos"><a class="header" href="#windows--macos">Windows / macOS</a></h2>
<p>Not first-class yet. The Linux-only system tray (<code>ksni</code>) and file dialog
(<code>rfd</code> xdg-portal) need per-OS backends before a clean cross-build; the
rest of the stack already compiles. See the
<a href="#platform-support">architecture notes</a>.</p>
<div style="break-before: page; page-break-before: always;"></div>
<h1 id="first-run--configuration"><a class="header" href="#first-run--configuration">First run &amp; configuration</a></h1>
<h2 id="the-config-file"><a class="header" href="#the-config-file">The config file</a></h2>
<p>yt-offline reads <code>config.toml</code> <strong>from its working directory</strong> (the
directory you launch it from), not a fixed path. The same goes for
<code>cookies.txt</code>. Everything in <code>config.toml</code> is also editable in Settings;
edits there are written back to the file.</p>
<pre><code class="language-toml">[backup]
directory = "/path/to/library" # the umbrella dir; all platforms nest under it
max_concurrent = 3 # parallel yt-dlp processes
use_bundled_ytdlp = false # true = use the managed venv (see below)
use_pot_provider = false # YouTube Proof-of-Origin tokens (see Anti-bot)
youtube_player_clients = "" # e.g. "tv,mweb" to route around captchas
[player]
command = "mpv" # any executable taking a file path as its last arg
browser = "firefox" # cookie source when no cookies.txt is set (see Anti-bot)
[ui]
theme = "dark" # dark | light | dracula | trans | emo-nocturnal | emo-coffin | emo-scene-queen
ui_scale = 1.0 # global zoom for the whole desktop UI
[scheduler]
enabled = false
interval_hours = 24 # auto re-check every channel for new uploads
[web]
port = 8080
bind = "127.0.0.1" # 127.0.0.1 | 0.0.0.0 | a Tailscale/LAN address
transcode = false # MKV → MP4 on the fly for browsers that can't decode MKV
[subtitles]
enabled = true
auto_generated = true # include machine captions
embed = false # also embed into the container
format = "" # "" = native; "srt" for Plex compatibility
langs = "" # "" = all; "en" or "en,ja" to filter
[convert]
mode = "" # "" / "remux-mp4" / "h264-mp4" / "audio"
crf = 23 # for h264-mp4 (lower = bigger/better)
preset = "medium"
audio_format = "mp3" # for audio mode
keep_original = false # keep &lt;name&gt;.original.&lt;ext&gt; after converting
[plex]
library_path = "/path/to/plex/TV/youtube" # leave unset to disable
</code></pre>
<h2 id="the-library-layout"><a class="header" href="#the-library-layout">The library layout</a></h2>
<p>Everything nests under the one <code>backup.directory</code>:</p>
<pre><code class="language-text">&lt;backup.directory&gt;/
channels/ ← YouTube creators
tiktok/ twitch/ vimeo/ bandcamp/ soundcloud/ odysee/ other/
music/ ← audio-only "Music mode" downloads, by artist
archive.txt ← yt-dlp's global download archive
cookies.txt ← optional, if you set one
yt-offline.db ← watched/positions/flags/folders/notes/cache + password hash
</code></pre>
<p>Each creator folder gets a hidden <code>.source-url</code> sidecar so re-checks
always know the exact URL to refresh from.</p>
<h2 id="bundled-vs-system-yt-dlp"><a class="header" href="#bundled-vs-system-yt-dlp">Bundled vs system yt-dlp</a></h2>
<p>In <strong>Settings → yt-dlp binary</strong> you choose:</p>
<ul>
<li><strong>System</strong> — uses whatever <code>yt-dlp</code> is on your <code>PATH</code>.</li>
<li><strong>Bundled</strong> — click <strong>Install</strong> and yt-offline builds a self-contained
venv at <code>~/.local/share/yt-offline/</code>: nightly <code>yt-dlp[default]</code> +
<code>curl_cffi</code> (TLS impersonation) + a bundled <code>deno</code> (player-JS). The
same button updates it later.</li>
</ul>
<p>The bundled path is recommended — it installs <strong>nightly</strong> yt-dlp, which
keeps pace with YouTube’s frequent anti-bot changes (stable lags). It’s
also required for the <a href="#3-pot-tokens-proof-of-origin">POT token provider</a>.</p>
<h2 id="the-two-front-ends"><a class="header" href="#the-two-front-ends">The two front-ends</a></h2>
<ul>
<li><code>yt-offline</code> — desktop GUI (eframe/egui).</li>
<li><code>yt-offline --web [PORT]</code> — headless web server. Bind to <code>127.0.0.1</code>
(default) for localhost-only, a Tailscale address for your tailnet, or
<code>0.0.0.0</code> for the LAN. <strong>Set a password</strong> (Settings) before exposing it
beyond localhost — the UI and all <code>/api</code> routes are then gated behind an
Argon2-hashed, rate-limited login.</li>
</ul>
<div style="break-before: page; page-break-before: always;"></div>
<h1 id="downloading"><a class="header" href="#downloading">Downloading</a></h1>
<h2 id="starting-a-download"><a class="header" href="#starting-a-download">Starting a download</a></h2>
<p>Paste any supported URL into the download bar (desktop) or the ⬇
Downloads modal (web). yt-offline classifies the URL by platform, routes
it to the right folder, and starts yt-dlp. A channel/playlist URL pulls
the whole thing; a single-video URL pulls just that one.</p>
<p><strong>Quality picker:</strong> Best / 1080p / 720p / 480p / 360p, or <strong>Music mode</strong>
for audio-only extraction into <code>music/&lt;artist&gt;/</code>.</p>
<p><strong>Fast mode</strong> stops at the first already-downloaded video (quick routine
re-checks). Turn it off for a full gap-filling scan.</p>
<h2 id="per-channel-options"><a class="header" href="#per-channel-options">Per-channel options</a></h2>
<p>Right-click a channel (or use the ⚙ on its sidebar row) for overrides
that apply to scheduled re-checks and the “Check for new videos” action:</p>
<ul>
<li>Quality cap, audio-only, bandwidth cap, min/max file size, date cutoff.</li>
<li>A free-form <code>--match-filter</code> (e.g. <code>duration &gt; 60 &amp; view_count &gt; 100</code>).</li>
<li>Subtitle overrides, YouTube player-client override, post-download
convert mode — each defaulting to the global setting.</li>
<li><strong>Skip auth check</strong> — silences yt-dlp’s “playlists that require
authentication” warning for <strong>public</strong> channels (see
<a href="#the-youtubetab-authentication-warning">Troubleshooting</a>).</li>
</ul>
<p>Per-channel options ride along in library backup/restore.</p>
<h2 id="subtitles"><a class="header" href="#subtitles">Subtitles</a></h2>
<p>Global defaults (Settings → Subtitles) + per-channel overrides control:
download on/off, auto-generated captions, embedding into the container,
language filter, and format conversion (<code>srt</code> is the most
Plex/player-compatible). Subtitles are written as sidecar files and
optionally embedded.</p>
<h2 id="format-conversion"><a class="header" href="#format-conversion">Format conversion</a></h2>
<p>A post-download ffmpeg pass (Settings → Format conversion, or per
channel):</p>
<ul>
<li><strong>Remux → mp4</strong> — instant container change, no re-encode (device/Plex
compatibility).</li>
<li><strong>Re-encode → H.264 mp4</strong> — shrink large 4K files at a chosen CRF +
x264 preset.</li>
<li><strong>Extract audio</strong> — mp3 / m4a / opus / flac.</li>
</ul>
<p>It runs as a distinct transcode job after the download. <strong>Keep original</strong>
preserves <code>&lt;name&gt;.original.&lt;ext&gt;</code> alongside the converted file; otherwise
the source is removed once the convert succeeds.</p>
<h2 id="resilience"><a class="header" href="#resilience">Resilience</a></h2>
<p>Downloads are hardened against YouTube’s flakiness automatically:</p>
<ul>
<li><strong>Retry + backoff</strong> on connection resets (<code>--retries 30</code>, linear
retry-sleep).</li>
<li><strong>Jittered throttle</strong> between videos so a long channel scan doesn’t
look robotic and trip the captcha wall.</li>
<li><strong>Auto-retry</strong> of transient (rate-limit / network / captcha) failures
after a cooldown, with adaptive slow-down for the rest of the batch.</li>
<li><strong>Hang watchdog</strong> kills a job that produces no output for 5 minutes (a
wedged request) and re-queues it.</li>
</ul>
<p>Failures are classified and shown with a one-line suggested fix — see
<a href="#troubleshooting">Troubleshooting</a>.</p>
<h2 id="scheduler"><a class="header" href="#scheduler">Scheduler</a></h2>
<p>Enable it (Settings → Auto-check channels) to re-check every channel for
new uploads on an interval. Each channel uses its own stored options.
There’s also a per-folder “Check all” action.</p>
<div style="break-before: page; page-break-before: always;"></div>
<h1 id="staying-ahead-of-youtubes-bot-detection"><a class="header" href="#staying-ahead-of-youtubes-bot-detection">Staying ahead of YouTube’s bot detection</a></h1>
<p>YouTube increasingly fingerprints and rate-limits automated clients.
yt-offline ships a layered defense; understanding the layers makes the
difference between “everything downloads” and “constant captchas.”</p>
<p>In rough order of impact:</p>
<h2 id="1-be-logged-in-cookies"><a class="header" href="#1-be-logged-in-cookies">1. Be logged in (cookies)</a></h2>
<p>This is the single biggest factor. <strong>Anonymous requests get captcha-
walled the hardest.</strong> Provide a <code>cookies.txt</code> exported from a browser
where you are <strong>signed in to YouTube</strong>, or point yt-offline at the
browser profile directly.</p>
<p>A <em>valid</em> logged-in jar contains the auth cookies <code>SID</code>, <code>SAPISID</code>,
<code>__Secure-1PSID</code>, <code>__Secure-3PSID</code>, <code>LOGIN_INFO</code>, etc. A jar with only
<code>VISITOR_INFO1_LIVE</code>, <code>PREF</code>, <code>YSC</code> is <strong>anonymous</strong> — it’s not signed in
and actually makes detection <em>worse</em> than no cookies. yt-offline’s
Settings → Cookies panel warns you when your jar is anonymous or expired.</p>
<p>Two ways to supply cookies:</p>
<ul>
<li>
<p><strong>Export a <code>cookies.txt</code></strong> with a browser extension like <em>Get
cookies.txt LOCALLY</em>, then paste/upload it in Settings → Cookies. A
file in the working directory takes precedence over the browser option.</p>
</li>
<li>
<p><strong>Read the browser profile live</strong> by setting the cookie browser to a
yt-dlp <code>--cookies-from-browser</code> spec. Plain <code>firefox</code>/<code>chrome</code>/<code>brave</code>
works for default profiles; for a non-default profile (e.g. Brave’s
beta channel) use the full form:</p>
<pre><code>brave:/home/you/.config/BraveSoftware/Brave-Origin-Beta
</code></pre>
<p>The path is the <strong>profile root</strong> (yt-dlp appends the <code>Default</code>
subdirectory itself). The advantage: cookies are read fresh from the
live session each download, so they never go stale.</p>
</li>
</ul>
<blockquote>
<p>Cookies are session credentials — yt-offline never commits or transmits
<code>cookies.txt</code> unprompted, and redacts the cookie path out of any log
line shown in the UI.</p>
</blockquote>
<h2 id="2-tls-impersonation-curl_cffi"><a class="header" href="#2-tls-impersonation-curl_cffi">2. TLS impersonation (curl_cffi)</a></h2>
<p>yt-dlp’s <code>--impersonate</code> makes requests carry a real browser’s TLS
fingerprint (via <code>curl_cffi</code>), so the connection doesn’t <em>look</em> like a
script. The bundled install sets this up automatically and yt-offline
picks an impersonation target per platform.</p>
<p>If impersonation silently does nothing, it’s almost always a
<strong>yt-dlp ⇄ curl_cffi version mismatch</strong> — which is exactly why the
bundled install uses <strong>nightly</strong> yt-dlp (it accepts current curl_cffi;
stable lags and disables all impersonate targets when a newer curl_cffi
is present). See
<a href="#impersonate-targets-show-unavailable">Troubleshooting → impersonation</a>.</p>
<h2 id="3-pot-tokens-proof-of-origin"><a class="header" href="#3-pot-tokens-proof-of-origin">3. POT tokens (Proof-of-Origin)</a></h2>
<p>YouTube increasingly binds a per-video <strong>Proof-of-Origin token</strong> to
playback; without one, format URLs come back empty. yt-offline can run
<a href="https://github.com/jim60105/bgutil-ytdlp-pot-provider-rs">bgutil-pot</a>, a
loopback HTTP server that mints these tokens, and point yt-dlp at it.</p>
<p>Enable <strong>Settings → Use POT token provider</strong> (requires the bundled
yt-dlp; the matching plugin installs into its venv) and click <strong>Install</strong>.</p>
<blockquote>
<p><strong>Version-skew footgun:</strong> the yt-dlp plugin must come from the <em>same
release</em> as the bgutil-pot server binary — <strong>not</strong> the PyPI package,
which versions independently and silently produces no tokens on a
mismatch. yt-offline’s installer handles this by unpacking the
version-matched plugin zip from the server’s release.</p>
</blockquote>
<h2 id="4-player-client-selection"><a class="header" href="#4-player-client-selection">4. Player-client selection</a></h2>
<p>YouTube cracks down on different internal “player clients” over time —
the <code>web</code> client is currently the most captcha-prone, while <code>tv</code> and
<code>mweb</code> are the least. yt-offline no longer forces <code>web</code>; it lets yt-dlp
pick good defaults. If a specific channel keeps hitting captchas, set a
client override (global or per-channel):</p>
<pre><code>tv,mweb
</code></pre>
<h2 id="5-throttling"><a class="header" href="#5-throttling">5. Throttling</a></h2>
<p>A burst of ~30 rapid requests is a classic trip-wire. yt-offline inserts
a small jittered pause between videos (a fixed cadence looks robotic; a
random one looks human) and, after any rate-limit hit, triples the
sleeps for the rest of the batch before recovering.</p>
<hr>
<p><strong>TL;DR for a clean setup:</strong> bundled (nightly) yt-dlp + fresh
<strong>logged-in</strong> cookies + POT provider enabled. That combination resolves
the vast majority of captcha / “Video unavailable” failures.</p>
<div style="break-before: page; page-break-before: always;"></div>
<h1 id="troubleshooting"><a class="header" href="#troubleshooting">Troubleshooting</a></h1>
<p>yt-offline classifies failed downloads into one of nine classes and shows
a one-line suggested fix next to the failed job. This page expands on the
most common ones, plus a few non-download issues.</p>
<h2 id="video-unavailable-youtube-is-requiring-a-captcha-challenge"><a class="header" href="#video-unavailable-youtube-is-requiring-a-captcha-challenge">“Video unavailable. YouTube is requiring a captcha challenge”</a></h2>
<p><strong>Class:</strong> rate-limited. <strong>Not</strong> a removed video — it’s the bot-detection
wall. In order of effectiveness:</p>
<ol>
<li><strong>Use fresh, logged-in cookies.</strong> Anonymous cookies are the usual
culprit — see <a href="#1-be-logged-in-cookies">Anti-bot → cookies</a>.
Settings → Cookies warns when your jar is anonymous or expired.</li>
<li><strong>Switch to bundled (nightly) yt-dlp</strong> if you’re on system stable.</li>
<li><strong>Enable the POT token provider.</strong></li>
<li><strong>Try a player-client override</strong> of <code>tv,mweb</code> for that channel.</li>
<li>If it’s a one-off, just wait — yt-offline auto-retries transient
rate-limits after a cooldown.</li>
</ol>
<h2 id="impersonate-targets-show-unavailable"><a class="header" href="#impersonate-targets-show-unavailable">Impersonate targets show “(unavailable)”</a></h2>
<p><code>yt-dlp --list-impersonate-targets</code> lists every target as <code>(unavailable)</code>
even though <code>curl_cffi</code> is installed.</p>
<p><strong>Cause:</strong> a yt-dlp ⇄ curl_cffi version gate. Stable yt-dlp caps the
curl_cffi version it accepts; a newer curl_cffi makes it disable <em>all</em>
impersonate targets.</p>
<p><strong>Fix:</strong> use the <strong>bundled</strong> yt-dlp (it installs nightly via <code>--pre</code>,
which accepts current curl_cffi), or pin curl_cffi to a compatible
version in your own environment.</p>
<h2 id="pot-provider-produces-no-tokens"><a class="header" href="#pot-provider-produces-no-tokens">POT provider produces no tokens</a></h2>
<p>You enabled the POT provider and installed it, but downloads still fail
as if no token was generated. yt-dlp logs a <em>“plugin and HTTP server
major versions are mismatched”</em> warning.</p>
<p><strong>Cause:</strong> the yt-dlp plugin came from PyPI (Brainicism’s package, which
versions independently) instead of the jim60105 Rust server’s release.</p>
<p><strong>Fix:</strong> re-run the POT <strong>Install/Update</strong> button — yt-offline installs
the version-matched plugin zip from the same release as the server
binary. Don’t <code>pip install bgutil-ytdlp-pot-provider</code> yourself.</p>
<h2 id="the-youtubetab-authentication-warning"><a class="header" href="#the-youtubetab-authentication-warning">The youtubetab authentication warning</a></h2>
<pre><code>ERROR: [youtube:tab] @Channel: Playlists that require authentication may
not extract correctly without a successful webpage download...
</code></pre>
<p>Despite the <code>ERROR:</code> prefix this is a soft warning, usually a symptom of
the bot-detection issues above (YouTube served an incomplete page). It
does <strong>not</strong> change which videos are found.</p>
<p><strong>Fix:</strong> for <strong>public</strong> channels, enable <strong>Skip auth check</strong> in that
channel’s options (adds <code>--extractor-args youtubetab:skip=authcheck</code>) to
silence it. Leave it <strong>off</strong> for members-only/private channels you
archive with cookies — there the warning is a real “your cookies may not
be working” signal.</p>
<h2 id="sign-in-to-confirm-youre-not-a-bot"><a class="header" href="#sign-in-to-confirm-youre-not-a-bot">“Sign in to confirm you’re not a bot”</a></h2>
<p>Same family as the captcha wall. Fix with fresh logged-in cookies + POT;
see <a href="#staying-ahead-of-youtubes-bot-detection">Anti-bot</a>.</p>
<h2 id="downloads-stall-forever"><a class="header" href="#downloads-stall-forever">Downloads stall forever</a></h2>
<p>A job sits running with no progress. yt-offline’s <strong>hang watchdog</strong>
auto-kills any job silent for 5 minutes and re-queues it, so this should
self-heal. If it recurs on a specific URL, it’s usually a server-side
issue with that source; check the job log in the Downloads panel.</p>
<h2 id="disk-fills-up--downloads-fail-with-enospc"><a class="header" href="#disk-fills-up--downloads-fail-with-enospc">Disk fills up / downloads fail with ENOSPC</a></h2>
<p>yt-offline runs a <strong>disk-full preflight</strong> and refuses to start a download
when the target filesystem has less than ~500 MB free, surfacing it as a
clear “disk full” failure rather than a half-written file. Free space and
retry.</p>
<h2 id="a-whole-platform-folder-shows-up-as-one-channel"><a class="header" href="#a-whole-platform-folder-shows-up-as-one-channel">A whole platform folder shows up as one “channel”</a></h2>
<p>If you see <code>bandcamp</code>, <code>tiktok</code>, or <code>channels</code> listed as a single channel
in the sidebar, your library directory predates the current layout. All
platforms must <strong>nest under</strong> the one <code>backup.directory</code>
(<code>&lt;dir&gt;/channels/</code>, <code>&lt;dir&gt;/tiktok/</code>, …). Move stray creator folders into
their platform’s subdir; see <a href="#the-library-layout">First run → library layout</a>.</p>
<h2 id="the-desktop-window-crashes-on-maximize"><a class="header" href="#the-desktop-window-crashes-on-maximize">The desktop window crashes on maximize</a></h2>
<p>Older builds crashed with a Glutin <code>EGL_BAD_ALLOC</code> on NVIDIA + Wayland
when maximized. Current builds use the <strong>wgpu (Vulkan)</strong> renderer, which
handles the resize cleanly. Make sure you have a working Vulkan driver
(<code>vulkan-icd-loader</code> + your GPU’s Vulkan package), which any desktop with
working graphics already has.</p>
<h2 id="the-web-ui-looks-like-an-old-version-after-an-upgrade"><a class="header" href="#the-web-ui-looks-like-an-old-version-after-an-upgrade">The web UI looks like an old version after an upgrade</a></h2>
<p>The SPA is served <code>Cache-Control: no-store</code>, so a hard reload
(Ctrl+Shift+R) always picks up the new binary’s UI. If you upgraded the
binary, also <strong>restart the running <code>--web</code> process</strong> — the HTML is baked
into the binary at compile time, so the old process keeps serving the old
UI until restarted.</p>
<h2 id="where-to-look-next"><a class="header" href="#where-to-look-next">Where to look next</a></h2>
<ul>
<li><strong>The job log</strong> — every download/transcode job keeps its full yt-dlp /
ffmpeg output in the Downloads panel (expand the job).</li>
<li><strong><code>yt-offline.crash.log</code></strong> — next to your <code>yt-offline.db</code>. A panic in
any thread (UI, web worker, download) is appended here with a
timestamp, so it survives a GUI launched without a terminal.</li>
</ul>
<div style="break-before: page; page-break-before: always;"></div>
<h1 id="architecture"><a class="header" href="#architecture">Architecture</a></h1>
<p>For contributors. The repo’s <code>CLAUDE.md</code> is the terse version of this;
read both.</p>
<h2 id="two-front-ends-one-engine"><a class="header" href="#two-front-ends-one-engine">Two front-ends, one engine</a></h2>
<p><code>main.rs</code> dispatches: <code>--web</code> → <code>web::run()</code> (axum, blocks forever);
otherwise <code>app::App</code> (eframe/egui desktop GUI). <strong>Both share
<code>downloader::Downloader</code></strong>, the single source of truth for the yt-dlp job
lifecycle.</p>
<p><code>Downloader</code> is <strong>not</strong> async — it spawns an OS thread per yt-dlp process,
streams stdout/stderr back over an <code>mpsc</code> channel into each <code>Job</code>’s log
buffer, and the caller pumps <code>Downloader::poll()</code> regularly (the egui
frame loop and a web background task both do). Anything you add to
<code>Downloader</code> is automatically available to both UIs.</p>
<p><code>poll()</code> also drives the cross-cutting job machinery: auto-retry of
transient failures (cooldown + adaptive throttle), the hang watchdog, and
the post-download ffmpeg transcode pass. These work by capturing specs
onto the <code>Job</code> at <code>start()</code> time (<code>RetrySpec</code>, <code>ConvertSpec</code>) and acting
on them when the job changes state.</p>
<h2 id="the-settings-flow-the-easy-thing-to-get-wrong"><a class="header" href="#the-settings-flow-the-easy-thing-to-get-wrong">The settings flow (the easy thing to get wrong)</a></h2>
<p>Almost every configurable feature has the same five-touchpoint shape —
miss one and it silently half-works:</p>
<ol>
<li><code>config.rs</code> — a field/section + its <code>Default</code> + the <code>default_with_dir</code>
constructor.</li>
<li><code>download_options.rs</code> — an <code>Option&lt;…&gt;</code> per-channel override (None =
defer to global).</li>
<li><code>downloader.rs</code> — a resolver merging global config + per-channel
override into yt-dlp/ffmpeg args, plus a <code>pub</code> field on <code>Downloader</code>
holding the global default.</li>
<li><strong>Both</strong> UIs render the global setting <em>and</em> the per-channel override:
desktop in <code>app.rs</code>, web in <code>web_ui/index.html</code> <strong>and</strong> <code>web.rs</code>’s
<code>SettingsPayload</code> (GET reads config, POST writes config + pushes onto
the live <code>Downloader</code>).</li>
<li>Seed the <code>Downloader</code> field at construction <strong>and</strong> on settings-save,
in <strong>both</strong> <code>app.rs</code> and <code>web.rs</code>.</li>
</ol>
<p><code>subtitle_defaults</code>, <code>youtube_player_clients</code>, and <code>convert_defaults</code> are
complete worked examples — grep one end-to-end before adding a setting.</p>
<h2 id="filesystem-layout"><a class="header" href="#filesystem-layout">Filesystem layout</a></h2>
<p><code>platform::platform_root(channels_root, platform)</code> =
<code>channels_root.join(dir_name)</code>. <strong>All</strong> platforms (including YouTube,
whose <code>dir_name</code> is <code>channels</code>) nest under the one configured
<code>backup.directory</code>. <code>.source-url</code> sidecars in each creator folder let
re-checks recover the exact URL. Library scanning (<code>library.rs</code>) is
parallel and consults a <code>(path, mtime)</code> SQLite cache to skip re-parsing
unchanged <code>info.json</code> sidecars.</p>
<h2 id="persistence"><a class="header" href="#persistence">Persistence</a></h2>
<p><code>database.rs</code> wraps an r2d2 SQLite pool. <code>Database</code> is cheaply <code>Clone</code>
(the pool is an <code>Arc</code>), so the parallel scanner takes its own handle.
Schema lives in <code>init_schema()</code>; new columns are added via idempotent
<code>ALTER TABLE … ADD COLUMN</code> that swallows the duplicate-column error (no
migration framework). The web UI keeps library/notes snapshots in memory;
mutating endpoints mirror DB writes onto those caches and bump a version
counter (the <code>/api/library</code> ETag) so reads stay consistent without a
rescan.</p>
<p>The long-lived <code>WebState</code> mutexes are accessed via
<code>util::LockExt::lock_recover()</code>, which recovers a poisoned lock instead of
cascading one handler’s panic into a dead server.</p>
<h2 id="web-ui-is-one-embedded-file"><a class="header" href="#web-ui-is-one-embedded-file">Web UI is one embedded file</a></h2>
<p><code>web_ui/index.html</code> is the entire SPA (HTML+CSS+JS), <code>include_str!</code>-baked
into the binary at compile time — editing it requires a rebuild. Served
<code>Cache-Control: no-store</code> so binary upgrades don’t strand stale tabs.
Progress streams over <code>/ws/progress</code> (WebSocket) with an HTTP-poll
fallback.</p>
<h2 id="anti-bot-subsystems"><a class="header" href="#anti-bot-subsystems">Anti-bot subsystems</a></h2>
<p><code>ytdlp_bin.rs</code> manages the optional self-contained venv at
<code>~/.local/share/yt-offline/</code> (nightly <code>yt-dlp[default]</code> + <code>curl_cffi</code> +
bundled <code>deno</code>). <code>pot_provider.rs</code> runs <code>bgutil-pot</code> for Proof-of-Origin
tokens — its yt-dlp plugin must come from the same release as the server
binary. <code>error_class.rs</code> pattern-matches yt-dlp stderr into actionable
classes (order matters in <code>classify()</code>: the captcha “Video unavailable”
wall is RateLimited, not NotFound).</p>
<h2 id="tests"><a class="header" href="#tests">Tests</a></h2>
<ul>
<li>Unit tests are inline <code>#[cfg(test)]</code> modules (parsers, resolvers, the
error classifier, DB merge logic).</li>
<li><code>tests/api.rs</code> spawns the <strong>real</strong> <code>--web</code> binary against a scratch dir
and drives the HTTP API with curl — genuine end-to-end coverage of the
axum + SQLite + config stack.</li>
</ul>
<p><code>cargo test</code> runs both. (A <code>.forgejo/workflows/test.yml</code> CI definition
exists, but Codeberg runs Woodpecker rather than Forgejo Actions, so it
doesn’t execute there without a self-hosted runner — run the suite
locally.)</p>
<h2 id="platform-support"><a class="header" href="#platform-support">Platform support</a></h2>
<p>Tray (<code>ksni</code>) and file dialogs (<code>rfd</code> xdg-portal) are Linux-only / no-GTK
by design — that’s why packaging avoids a GTK dependency. Windows/macOS
aren’t first-class yet: the tray needs a per-OS backend before a clean
cross-build. The rest (eframe/wgpu, axum, rusqlite-bundled) already
compiles cross-platform, and <code>ytdlp_bin</code> already has <code>cfg!(windows)</code>
branches.</p>
<div style="break-before: page; page-break-before: always;"></div>
<h1 id="packaging"><a class="header" href="#packaging">Packaging</a></h1>
<p>Build distributable Linux packages with one script:</p>
<pre><code class="language-sh">scripts/package.sh all # .deb + .rpm + .AppImage → dist/
scripts/package.sh deb # just the .deb
scripts/package.sh rpm
scripts/package.sh appimage
</code></pre>
<p>It builds the release binary once and reuses it for every format,
installing <code>cargo-deb</code> / <code>cargo-generate-rpm</code> on demand and downloading
<code>appimagetool</code> to <code>dist/tools/</code> on first AppImage build. Per-format
failures are isolated and summarized at the end. Output (gitignored)
lands in <code>dist/</code>.</p>
<h2 id="formats"><a class="header" href="#formats">Formats</a></h2>
<ul>
<li><strong><code>.deb</code></strong> — built by <a href="https://github.com/kornelski/cargo-deb">cargo-deb</a>
from <code>[package.metadata.deb]</code> in <code>Cargo.toml</code>.</li>
<li><strong><code>.rpm</code></strong> — built by
<a href="https://github.com/cat-in-136/cargo-generate-rpm">cargo-generate-rpm</a>
from <code>[package.metadata.generate-rpm]</code>. (<code>ffmpeg</code> on Fedora is in
RPM Fusion.)</li>
<li><strong>AppImage</strong> — a hand-rolled AppDir + appimagetool. Bundles the GUI
binary’s shared-library closure only; <code>yt-dlp</code>/<code>ffmpeg</code>/<code>mpv</code> stay host
PATH deps, same as the package declarations.</li>
<li><strong>Arch</strong> — use the repo’s <code>PKGBUILD</code> (not this script); run <code>makepkg</code>
from a clean directory.</li>
</ul>
<h2 id="ci"><a class="header" href="#ci">CI</a></h2>
<p>The repo ships <code>.forgejo/workflows/</code> definitions (<code>test.yml</code>,
<code>release.yml</code>), but Codeberg executes Woodpecker rather than Forgejo
Actions — so they don’t run there without a self-hosted runner. Until
then, build packages locally with <code>scripts/package.sh</code> and publish docs
with <code>scripts/publish-docs.sh</code>.</p>
<p>The repo’s <a href="https://codeberg.org/anassaeneroi/yt-offline/src/branch/main/docs/PACKAGING.md"><code>docs/PACKAGING.md</code></a>
has the per-distro install commands and the Windows/macOS status in full.</p>
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if (window_weight[i] > max_sum) {
max_sum = window_weight[i];
max_sum_window_index = i;
}
}
} else {
max_sum_window_index = 0;
}
// add <em/> around searchterms
const teaser_split = [];
index = weighted[max_sum_window_index][2];
for (let i = max_sum_window_index; i < max_sum_window_index + window_size; i++) {
const word = weighted[i];
if (index < word[2]) {
// missing text from index to start of `word`
teaser_split.push(body.substring(index, word[2]));
index = word[2];
}
if (word[1] === searchterm_weight) {
teaser_split.push('<em>');
}
index = word[2] + word[0].length;
teaser_split.push(body.substring(word[2], index));
if (word[1] === searchterm_weight) {
teaser_split.push('</em>');
}
}
return teaser_split.join('');
}
function init(config) {
results_options = config.results_options;
search_options = config.search_options;
doc_urls = config.doc_urls;
searchindex = elasticlunr.Index.load(config.index);
searchbar_outer.classList.remove('searching');
searchbar.focus();
const searchterm = searchbar.value.trim();
if (searchterm !== '') {
searchbar.classList.add('active');
doSearch(searchterm);
}
}
function initSearchInteractions(config) {
// Set up events
searchicon.addEventListener('click', () => {
searchIconClickHandler();
}, false);
searchbar.addEventListener('keyup', () => {
searchbarKeyUpHandler();
}, false);
document.addEventListener('keydown', e => {
globalKeyHandler(e);
}, false);
// If the user uses the browser buttons, do the same as if a reload happened
window.onpopstate = () => {
doSearchOrMarkFromUrl();
};
// Suppress "submit" events so the page doesn't reload when the user presses Enter
document.addEventListener('submit', e => {
e.preventDefault();
}, false);
// If reloaded, do the search or mark again, depending on the current url parameters
doSearchOrMarkFromUrl();
// Exported functions
config.hasFocus = hasFocus;
}
initSearchInteractions(window.search);
function unfocusSearchbar() {
// hacky, but just focusing a div only works once
const tmp = document.createElement('input');
tmp.setAttribute('style', 'position: absolute; opacity: 0;');
searchicon.appendChild(tmp);
tmp.focus();
tmp.remove();
}
// On reload or browser history backwards/forwards events, parse the url and do search or mark
function doSearchOrMarkFromUrl() {
// Check current URL for search request
const url = parseURL(window.location.href);
if (Object.prototype.hasOwnProperty.call(url.params, URL_SEARCH_PARAM)
&& url.params[URL_SEARCH_PARAM] !== '') {
showSearch(true);
searchbar.value = decodeURIComponent(
(url.params[URL_SEARCH_PARAM] + '').replace(/\+/g, '%20'));
searchbarKeyUpHandler(); // -> doSearch()
} else {
showSearch(false);
}
if (Object.prototype.hasOwnProperty.call(url.params, URL_MARK_PARAM)) {
const words = decodeURIComponent(url.params[URL_MARK_PARAM]).split(' ');
marker.mark(words, {
exclude: mark_exclude,
});
const markers = document.querySelectorAll('mark');
const hide = () => {
for (let i = 0; i < markers.length; i++) {
markers[i].classList.add('fade-out');
window.setTimeout(() => {
marker.unmark();
}, 300);
}
// also removes the `?URL_MARK_PARAM=` search param so that
// in-page navigation doesn't make highlights unexpectedly appear again
setSearchUrlParameters('', 'replace');
};
for (let i = 0; i < markers.length; i++) {
markers[i].addEventListener('click', hide);
}
}
}
// Eventhandler for keyevents on `document`
function globalKeyHandler(e) {
if (e.altKey ||
e.ctrlKey ||
e.metaKey ||
e.shiftKey ||
e.target.type === 'textarea' ||
e.target.type === 'text' ||
!hasFocus() && mdbook_something_else_has_focus(e)
) {
return;
}
if (e.key === 'Escape') {
e.preventDefault();
searchbar.classList.remove('active');
setSearchUrlParameters('',
searchbar.value.trim() !== '' ? 'push' : 'replace');
if (hasFocus()) {
unfocusSearchbar();
}
showSearch(false);
marker.unmark();
} else if (!hasFocus() && (e.key === 's' || e.key === '/')) {
e.preventDefault();
showSearch(true);
window.scrollTo(0, 0);
searchbar.select();
} else if (hasFocus() && (e.key === 'ArrowDown'
|| e.key === 'Enter')) {
e.preventDefault();
const first = searchresults.firstElementChild;
if (first !== null) {
unfocusSearchbar();
first.classList.add('focus');
if (e.key === 'Enter') {
window.location.assign(first.querySelector('a'));
}
}
} else if (!hasFocus() && (e.key === 'ArrowDown'
|| e.key === 'ArrowUp'
|| e.key === 'Enter')) {
// not `:focus` because browser does annoying scrolling
const focused = searchresults.querySelector('li.focus');
if (!focused) {
return;
}
e.preventDefault();
if (e.key === 'ArrowDown') {
const next = focused.nextElementSibling;
if (next) {
focused.classList.remove('focus');
next.classList.add('focus');
}
} else if (e.key === 'ArrowUp') {
focused.classList.remove('focus');
const prev = focused.previousElementSibling;
if (prev) {
prev.classList.add('focus');
} else {
searchbar.select();
}
} else { // Enter
window.location.assign(focused.querySelector('a'));
}
}
}
function loadSearchScript(url, id) {
if (document.getElementById(id)) {
return;
}
searchbar_outer.classList.add('searching');
const script = document.createElement('script');
script.src = url;
script.id = id;
script.onload = () => init(window.search);
script.onerror = error => {
console.error(`Failed to load \`${url}\`: ${error}`);
};
document.head.append(script);
}
function showSearch(yes) {
if (yes) {
loadSearchScript(
window.path_to_searchindex_js ||
path_to_root + 'searchindex-4723df7c.js',
'mdbook-search-index');
search_wrap.classList.remove('hidden');
searchicon.setAttribute('aria-expanded', 'true');
} else {
search_wrap.classList.add('hidden');
searchicon.setAttribute('aria-expanded', 'false');
const results = searchresults.children;
for (let i = 0; i < results.length; i++) {
results[i].classList.remove('focus');
}
}
}
function showResults(yes) {
if (yes) {
searchresults_outer.classList.remove('hidden');
} else {
searchresults_outer.classList.add('hidden');
}
}
// Eventhandler for search icon
function searchIconClickHandler() {
if (search_wrap.classList.contains('hidden')) {
showSearch(true);
window.scrollTo(0, 0);
searchbar.select();
} else {
showSearch(false);
}
}
// Eventhandler for keyevents while the searchbar is focused
function searchbarKeyUpHandler() {
const searchterm = searchbar.value.trim();
if (searchterm !== '') {
searchbar.classList.add('active');
doSearch(searchterm);
} else {
searchbar.classList.remove('active');
showResults(false);
removeChildren(searchresults);
}
setSearchUrlParameters(searchterm, 'push_if_new_search_else_replace');
// Remove marks
marker.unmark();
}
// Update current url with ?URL_SEARCH_PARAM= parameter, remove ?URL_MARK_PARAM and
// `#heading-anchor`. `action` can be one of "push", "replace",
// "push_if_new_search_else_replace" and replaces or pushes a new browser history item.
// "push_if_new_search_else_replace" pushes if there is no `?URL_SEARCH_PARAM=abc` yet.
function setSearchUrlParameters(searchterm, action) {
const url = parseURL(window.location.href);
const first_search = !Object.prototype.hasOwnProperty.call(url.params, URL_SEARCH_PARAM);
if (searchterm !== '' || action === 'push_if_new_search_else_replace') {
url.params[URL_SEARCH_PARAM] = searchterm;
delete url.params[URL_MARK_PARAM];
url.hash = '';
} else {
delete url.params[URL_MARK_PARAM];
delete url.params[URL_SEARCH_PARAM];
}
// A new search will also add a new history item, so the user can go back
// to the page prior to searching. A updated search term will only replace
// the url.
if (action === 'push' || action === 'push_if_new_search_else_replace' && first_search ) {
history.pushState({}, document.title, renderURL(url));
} else if (action === 'replace' ||
action === 'push_if_new_search_else_replace' &&
!first_search
) {
history.replaceState({}, document.title, renderURL(url));
}
}
function doSearch(searchterm) {
// Don't search the same twice
if (current_searchterm === searchterm) {
return;
}
searchbar_outer.classList.add('searching');
if (searchindex === null) {
return;
}
current_searchterm = searchterm;
// Do the actual search
const results = searchindex.search(searchterm, search_options);
const resultcount = Math.min(results.length, results_options.limit_results);
// Display search metrics
searchresults_header.innerText = formatSearchMetric(resultcount, searchterm);
// Clear and insert results
const searchterms = searchterm.split(' ');
removeChildren(searchresults);
for (let i = 0; i < resultcount ; i++) {
const resultElem = document.createElement('li');
resultElem.innerHTML = formatSearchResult(results[i], searchterms);
searchresults.appendChild(resultElem);
}
// Display results
showResults(true);
searchbar_outer.classList.remove('searching');
}
// Exported functions
search.hasFocus = hasFocus;
})(window.search);

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// Populate the sidebar
//
// This is a script, and not included directly in the page, to control the total size of the book.
// The TOC contains an entry for each page, so if each page includes a copy of the TOC,
// the total size of the page becomes O(n**2).
class MDBookSidebarScrollbox extends HTMLElement {
constructor() {
super();
}
connectedCallback() {
this.innerHTML = '<ol class="chapter"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="introduction.html">Introduction</a></span></li><li class="chapter-item expanded "><li class="part-title">Using yt-offline</li></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="installation.html"><strong aria-hidden="true">1.</strong> Installation</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="first-run.html"><strong aria-hidden="true">2.</strong> First run &amp; configuration</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="downloading.html"><strong aria-hidden="true">3.</strong> Downloading</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="anti-bot.html"><strong aria-hidden="true">4.</strong> Staying ahead of YouTube&#39;s bot detection</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="troubleshooting.html"><strong aria-hidden="true">5.</strong> Troubleshooting</a></span></li><li class="chapter-item expanded "><li class="part-title">Contributing</li></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="architecture.html"><strong aria-hidden="true">6.</strong> Architecture</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="packaging.html"><strong aria-hidden="true">7.</strong> Packaging</a></span></li></ol>';
// Set the current, active page, and reveal it if it's hidden
let current_page = document.location.href.toString().split('#')[0].split('?')[0];
if (current_page.endsWith('/')) {
current_page += 'index.html';
}
const links = Array.prototype.slice.call(this.querySelectorAll('a'));
const l = links.length;
for (let i = 0; i < l; ++i) {
const link = links[i];
const href = link.getAttribute('href');
if (href && !href.startsWith('#') && !/^(?:[a-z+]+:)?\/\//.test(href)) {
link.href = path_to_root + href;
}
// The 'index' page is supposed to alias the first chapter in the book.
// Check both with and without the '.html' suffix to be robust against pretty URLs
if (link.href.replace(/\.html$/, '') === current_page.replace(/\.html$/, '')
|| i === 0
&& path_to_root === ''
&& current_page.endsWith('/index.html')) {
link.classList.add('active');
let parent = link.parentElement;
while (parent) {
if (parent.tagName === 'LI' && parent.classList.contains('chapter-item')) {
parent.classList.add('expanded');
}
parent = parent.parentElement;
}
}
}
// Track and set sidebar scroll position
this.addEventListener('click', e => {
if (e.target.tagName === 'A') {
const clientRect = e.target.getBoundingClientRect();
const sidebarRect = this.getBoundingClientRect();
sessionStorage.setItem('sidebar-scroll-offset', clientRect.top - sidebarRect.top);
}
}, { passive: true });
const sidebarScrollOffset = sessionStorage.getItem('sidebar-scroll-offset');
sessionStorage.removeItem('sidebar-scroll-offset');
if (sidebarScrollOffset !== null) {
// preserve sidebar scroll position when navigating via links within sidebar
const activeSection = this.querySelector('.active');
if (activeSection) {
const clientRect = activeSection.getBoundingClientRect();
const sidebarRect = this.getBoundingClientRect();
const currentOffset = clientRect.top - sidebarRect.top;
this.scrollTop += currentOffset - parseFloat(sidebarScrollOffset);
}
} else {
// scroll sidebar to current active section when navigating via
// 'next/previous chapter' buttons
const activeSection = document.querySelector('#mdbook-sidebar .active');
if (activeSection) {
activeSection.scrollIntoView({ block: 'center' });
}
}
// Toggle buttons
const sidebarAnchorToggles = document.querySelectorAll('.chapter-fold-toggle');
function toggleSection(ev) {
ev.currentTarget.parentElement.parentElement.classList.toggle('expanded');
}
Array.from(sidebarAnchorToggles).forEach(el => {
el.addEventListener('click', toggleSection);
});
}
}
window.customElements.define('mdbook-sidebar-scrollbox', MDBookSidebarScrollbox);
// ---------------------------------------------------------------------------
// Support for dynamically adding headers to the sidebar.
(function() {
// This is used to detect which direction the page has scrolled since the
// last scroll event.
let lastKnownScrollPosition = 0;
// This is the threshold in px from the top of the screen where it will
// consider a header the "current" header when scrolling down.
const defaultDownThreshold = 150;
// Same as defaultDownThreshold, except when scrolling up.
const defaultUpThreshold = 300;
// The threshold is a virtual horizontal line on the screen where it
// considers the "current" header to be above the line. The threshold is
// modified dynamically to handle headers that are near the bottom of the
// screen, and to slightly offset the behavior when scrolling up vs down.
let threshold = defaultDownThreshold;
// This is used to disable updates while scrolling. This is needed when
// clicking the header in the sidebar, which triggers a scroll event. It
// is somewhat finicky to detect when the scroll has finished, so this
// uses a relatively dumb system of disabling scroll updates for a short
// time after the click.
let disableScroll = false;
// Array of header elements on the page.
let headers;
// Array of li elements that are initially collapsed headers in the sidebar.
// I'm not sure why eslint seems to have a false positive here.
// eslint-disable-next-line prefer-const
let headerToggles = [];
// This is a debugging tool for the threshold which you can enable in the console.
let thresholdDebug = false;
// Updates the threshold based on the scroll position.
function updateThreshold() {
const scrollTop = window.pageYOffset || document.documentElement.scrollTop;
const windowHeight = window.innerHeight;
const documentHeight = document.documentElement.scrollHeight;
// The number of pixels below the viewport, at most documentHeight.
// This is used to push the threshold down to the bottom of the page
// as the user scrolls towards the bottom.
const pixelsBelow = Math.max(0, documentHeight - (scrollTop + windowHeight));
// The number of pixels above the viewport, at least defaultDownThreshold.
// Similar to pixelsBelow, this is used to push the threshold back towards
// the top when reaching the top of the page.
const pixelsAbove = Math.max(0, defaultDownThreshold - scrollTop);
// How much the threshold should be offset once it gets close to the
// bottom of the page.
const bottomAdd = Math.max(0, windowHeight - pixelsBelow - defaultDownThreshold);
let adjustedBottomAdd = bottomAdd;
// Adjusts bottomAdd for a small document. The calculation above
// assumes the document is at least twice the windowheight in size. If
// it is less than that, then bottomAdd needs to be shrunk
// proportional to the difference in size.
if (documentHeight < windowHeight * 2) {
const maxPixelsBelow = documentHeight - windowHeight;
const t = 1 - pixelsBelow / Math.max(1, maxPixelsBelow);
const clamp = Math.max(0, Math.min(1, t));
adjustedBottomAdd *= clamp;
}
let scrollingDown = true;
if (scrollTop < lastKnownScrollPosition) {
scrollingDown = false;
}
if (scrollingDown) {
// When scrolling down, move the threshold up towards the default
// downwards threshold position. If near the bottom of the page,
// adjustedBottomAdd will offset the threshold towards the bottom
// of the page.
const amountScrolledDown = scrollTop - lastKnownScrollPosition;
const adjustedDefault = defaultDownThreshold + adjustedBottomAdd;
threshold = Math.max(adjustedDefault, threshold - amountScrolledDown);
} else {
// When scrolling up, move the threshold down towards the default
// upwards threshold position. If near the bottom of the page,
// quickly transition the threshold back up where it normally
// belongs.
const amountScrolledUp = lastKnownScrollPosition - scrollTop;
const adjustedDefault = defaultUpThreshold - pixelsAbove
+ Math.max(0, adjustedBottomAdd - defaultDownThreshold);
threshold = Math.min(adjustedDefault, threshold + amountScrolledUp);
}
if (documentHeight <= windowHeight) {
threshold = 0;
}
if (thresholdDebug) {
const id = 'mdbook-threshold-debug-data';
let data = document.getElementById(id);
if (data === null) {
data = document.createElement('div');
data.id = id;
data.style.cssText = `
position: fixed;
top: 50px;
right: 10px;
background-color: 0xeeeeee;
z-index: 9999;
pointer-events: none;
`;
document.body.appendChild(data);
}
data.innerHTML = `
<table>
<tr><td>documentHeight</td><td>${documentHeight.toFixed(1)}</td></tr>
<tr><td>windowHeight</td><td>${windowHeight.toFixed(1)}</td></tr>
<tr><td>scrollTop</td><td>${scrollTop.toFixed(1)}</td></tr>
<tr><td>pixelsAbove</td><td>${pixelsAbove.toFixed(1)}</td></tr>
<tr><td>pixelsBelow</td><td>${pixelsBelow.toFixed(1)}</td></tr>
<tr><td>bottomAdd</td><td>${bottomAdd.toFixed(1)}</td></tr>
<tr><td>adjustedBottomAdd</td><td>${adjustedBottomAdd.toFixed(1)}</td></tr>
<tr><td>scrollingDown</td><td>${scrollingDown}</td></tr>
<tr><td>threshold</td><td>${threshold.toFixed(1)}</td></tr>
</table>
`;
drawDebugLine();
}
lastKnownScrollPosition = scrollTop;
}
function drawDebugLine() {
if (!document.body) {
return;
}
const id = 'mdbook-threshold-debug-line';
const existingLine = document.getElementById(id);
if (existingLine) {
existingLine.remove();
}
const line = document.createElement('div');
line.id = id;
line.style.cssText = `
position: fixed;
top: ${threshold}px;
left: 0;
width: 100vw;
height: 2px;
background-color: red;
z-index: 9999;
pointer-events: none;
`;
document.body.appendChild(line);
}
function mdbookEnableThresholdDebug() {
thresholdDebug = true;
updateThreshold();
drawDebugLine();
}
window.mdbookEnableThresholdDebug = mdbookEnableThresholdDebug;
// Updates which headers in the sidebar should be expanded. If the current
// header is inside a collapsed group, then it, and all its parents should
// be expanded.
function updateHeaderExpanded(currentA) {
// Add expanded to all header-item li ancestors.
let current = currentA.parentElement;
while (current) {
if (current.tagName === 'LI' && current.classList.contains('header-item')) {
current.classList.add('expanded');
}
current = current.parentElement;
}
}
// Updates which header is marked as the "current" header in the sidebar.
// This is done with a virtual Y threshold, where headers at or below
// that line will be considered the current one.
function updateCurrentHeader() {
if (!headers || !headers.length) {
return;
}
// Reset the classes, which will be rebuilt below.
const els = document.getElementsByClassName('current-header');
for (const el of els) {
el.classList.remove('current-header');
}
for (const toggle of headerToggles) {
toggle.classList.remove('expanded');
}
// Find the last header that is above the threshold.
let lastHeader = null;
for (const header of headers) {
const rect = header.getBoundingClientRect();
if (rect.top <= threshold) {
lastHeader = header;
} else {
break;
}
}
if (lastHeader === null) {
lastHeader = headers[0];
const rect = lastHeader.getBoundingClientRect();
const windowHeight = window.innerHeight;
if (rect.top >= windowHeight) {
return;
}
}
// Get the anchor in the summary.
const href = '#' + lastHeader.id;
const a = [...document.querySelectorAll('.header-in-summary')]
.find(element => element.getAttribute('href') === href);
if (!a) {
return;
}
a.classList.add('current-header');
updateHeaderExpanded(a);
}
// Updates which header is "current" based on the threshold line.
function reloadCurrentHeader() {
if (disableScroll) {
return;
}
updateThreshold();
updateCurrentHeader();
}
// When clicking on a header in the sidebar, this adjusts the threshold so
// that it is located next to the header. This is so that header becomes
// "current".
function headerThresholdClick(event) {
// See disableScroll description why this is done.
disableScroll = true;
setTimeout(() => {
disableScroll = false;
}, 100);
// requestAnimationFrame is used to delay the update of the "current"
// header until after the scroll is done, and the header is in the new
// position.
requestAnimationFrame(() => {
requestAnimationFrame(() => {
// Closest is needed because if it has child elements like <code>.
const a = event.target.closest('a');
const href = a.getAttribute('href');
const targetId = href.substring(1);
const targetElement = document.getElementById(targetId);
if (targetElement) {
threshold = targetElement.getBoundingClientRect().bottom;
updateCurrentHeader();
}
});
});
}
// Takes the nodes from the given head and copies them over to the
// destination, along with some filtering.
function filterHeader(source, dest) {
const clone = source.cloneNode(true);
clone.querySelectorAll('mark').forEach(mark => {
mark.replaceWith(...mark.childNodes);
});
dest.append(...clone.childNodes);
}
// Scans page for headers and adds them to the sidebar.
document.addEventListener('DOMContentLoaded', function() {
const activeSection = document.querySelector('#mdbook-sidebar .active');
if (activeSection === null) {
return;
}
const main = document.getElementsByTagName('main')[0];
headers = Array.from(main.querySelectorAll('h2, h3, h4, h5, h6'))
.filter(h => h.id !== '' && h.children.length && h.children[0].tagName === 'A');
if (headers.length === 0) {
return;
}
// Build a tree of headers in the sidebar.
const stack = [];
const firstLevel = parseInt(headers[0].tagName.charAt(1));
for (let i = 1; i < firstLevel; i++) {
const ol = document.createElement('ol');
ol.classList.add('section');
if (stack.length > 0) {
stack[stack.length - 1].ol.appendChild(ol);
}
stack.push({level: i + 1, ol: ol});
}
// The level where it will start folding deeply nested headers.
const foldLevel = 3;
for (let i = 0; i < headers.length; i++) {
const header = headers[i];
const level = parseInt(header.tagName.charAt(1));
const currentLevel = stack[stack.length - 1].level;
if (level > currentLevel) {
// Begin nesting to this level.
for (let nextLevel = currentLevel + 1; nextLevel <= level; nextLevel++) {
const ol = document.createElement('ol');
ol.classList.add('section');
const last = stack[stack.length - 1];
const lastChild = last.ol.lastChild;
// Handle the case where jumping more than one nesting
// level, which doesn't have a list item to place this new
// list inside of.
if (lastChild) {
lastChild.appendChild(ol);
} else {
last.ol.appendChild(ol);
}
stack.push({level: nextLevel, ol: ol});
}
} else if (level < currentLevel) {
while (stack.length > 1 && stack[stack.length - 1].level > level) {
stack.pop();
}
}
const li = document.createElement('li');
li.classList.add('header-item');
li.classList.add('expanded');
if (level < foldLevel) {
li.classList.add('expanded');
}
const span = document.createElement('span');
span.classList.add('chapter-link-wrapper');
const a = document.createElement('a');
span.appendChild(a);
a.href = '#' + header.id;
a.classList.add('header-in-summary');
filterHeader(header.children[0], a);
a.addEventListener('click', headerThresholdClick);
const nextHeader = headers[i + 1];
if (nextHeader !== undefined) {
const nextLevel = parseInt(nextHeader.tagName.charAt(1));
if (nextLevel > level && level >= foldLevel) {
const toggle = document.createElement('a');
toggle.classList.add('chapter-fold-toggle');
toggle.classList.add('header-toggle');
toggle.addEventListener('click', () => {
li.classList.toggle('expanded');
});
const toggleDiv = document.createElement('div');
toggleDiv.textContent = '❱';
toggle.appendChild(toggleDiv);
span.appendChild(toggle);
headerToggles.push(li);
}
}
li.appendChild(span);
const currentParent = stack[stack.length - 1];
currentParent.ol.appendChild(li);
}
const onThisPage = document.createElement('div');
onThisPage.classList.add('on-this-page');
onThisPage.append(stack[0].ol);
const activeItemSpan = activeSection.parentElement;
activeItemSpan.after(onThisPage);
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<ol class="chapter"><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="introduction.html" target="_parent">Introduction</a></span></li><li class="chapter-item expanded "><li class="part-title">Using yt-offline</li></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="installation.html" target="_parent"><strong aria-hidden="true">1.</strong> Installation</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="first-run.html" target="_parent"><strong aria-hidden="true">2.</strong> First run &amp; configuration</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="downloading.html" target="_parent"><strong aria-hidden="true">3.</strong> Downloading</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="anti-bot.html" target="_parent"><strong aria-hidden="true">4.</strong> Staying ahead of YouTube&#39;s bot detection</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="troubleshooting.html" target="_parent"><strong aria-hidden="true">5.</strong> Troubleshooting</a></span></li><li class="chapter-item expanded "><li class="part-title">Contributing</li></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="architecture.html" target="_parent"><strong aria-hidden="true">6.</strong> Architecture</a></span></li><li class="chapter-item expanded "><span class="chapter-link-wrapper"><a href="packaging.html" target="_parent"><strong aria-hidden="true">7.</strong> Packaging</a></span></li></ol>
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<h1 id="troubleshooting"><a class="header" href="#troubleshooting">Troubleshooting</a></h1>
<p>yt-offline classifies failed downloads into one of nine classes and shows
a one-line suggested fix next to the failed job. This page expands on the
most common ones, plus a few non-download issues.</p>
<h2 id="video-unavailable-youtube-is-requiring-a-captcha-challenge"><a class="header" href="#video-unavailable-youtube-is-requiring-a-captcha-challenge">“Video unavailable. YouTube is requiring a captcha challenge”</a></h2>
<p><strong>Class:</strong> rate-limited. <strong>Not</strong> a removed video — it’s the bot-detection
wall. In order of effectiveness:</p>
<ol>
<li><strong>Use fresh, logged-in cookies.</strong> Anonymous cookies are the usual
culprit — see <a href="./anti-bot.html#1-be-logged-in-cookies">Anti-bot → cookies</a>.
Settings → Cookies warns when your jar is anonymous or expired.</li>
<li><strong>Switch to bundled (nightly) yt-dlp</strong> if you’re on system stable.</li>
<li><strong>Enable the POT token provider.</strong></li>
<li><strong>Try a player-client override</strong> of <code>tv,mweb</code> for that channel.</li>
<li>If it’s a one-off, just wait — yt-offline auto-retries transient
rate-limits after a cooldown.</li>
</ol>
<h2 id="impersonate-targets-show-unavailable"><a class="header" href="#impersonate-targets-show-unavailable">Impersonate targets show “(unavailable)”</a></h2>
<p><code>yt-dlp --list-impersonate-targets</code> lists every target as <code>(unavailable)</code>
even though <code>curl_cffi</code> is installed.</p>
<p><strong>Cause:</strong> a yt-dlp ⇄ curl_cffi version gate. Stable yt-dlp caps the
curl_cffi version it accepts; a newer curl_cffi makes it disable <em>all</em>
impersonate targets.</p>
<p><strong>Fix:</strong> use the <strong>bundled</strong> yt-dlp (it installs nightly via <code>--pre</code>,
which accepts current curl_cffi), or pin curl_cffi to a compatible
version in your own environment.</p>
<h2 id="pot-provider-produces-no-tokens"><a class="header" href="#pot-provider-produces-no-tokens">POT provider produces no tokens</a></h2>
<p>You enabled the POT provider and installed it, but downloads still fail
as if no token was generated. yt-dlp logs a <em>“plugin and HTTP server
major versions are mismatched”</em> warning.</p>
<p><strong>Cause:</strong> the yt-dlp plugin came from PyPI (Brainicism’s package, which
versions independently) instead of the jim60105 Rust server’s release.</p>
<p><strong>Fix:</strong> re-run the POT <strong>Install/Update</strong> button — yt-offline installs
the version-matched plugin zip from the same release as the server
binary. Don’t <code>pip install bgutil-ytdlp-pot-provider</code> yourself.</p>
<h2 id="the-youtubetab-authentication-warning"><a class="header" href="#the-youtubetab-authentication-warning">The youtubetab authentication warning</a></h2>
<pre><code>ERROR: [youtube:tab] @Channel: Playlists that require authentication may
not extract correctly without a successful webpage download...
</code></pre>
<p>Despite the <code>ERROR:</code> prefix this is a soft warning, usually a symptom of
the bot-detection issues above (YouTube served an incomplete page). It
does <strong>not</strong> change which videos are found.</p>
<p><strong>Fix:</strong> for <strong>public</strong> channels, enable <strong>Skip auth check</strong> in that
channel’s options (adds <code>--extractor-args youtubetab:skip=authcheck</code>) to
silence it. Leave it <strong>off</strong> for members-only/private channels you
archive with cookies — there the warning is a real “your cookies may not
be working” signal.</p>
<h2 id="sign-in-to-confirm-youre-not-a-bot"><a class="header" href="#sign-in-to-confirm-youre-not-a-bot">“Sign in to confirm you’re not a bot”</a></h2>
<p>Same family as the captcha wall. Fix with fresh logged-in cookies + POT;
see <a href="./anti-bot.html">Anti-bot</a>.</p>
<h2 id="downloads-stall-forever"><a class="header" href="#downloads-stall-forever">Downloads stall forever</a></h2>
<p>A job sits running with no progress. yt-offline’s <strong>hang watchdog</strong>
auto-kills any job silent for 5 minutes and re-queues it, so this should
self-heal. If it recurs on a specific URL, it’s usually a server-side
issue with that source; check the job log in the Downloads panel.</p>
<h2 id="disk-fills-up--downloads-fail-with-enospc"><a class="header" href="#disk-fills-up--downloads-fail-with-enospc">Disk fills up / downloads fail with ENOSPC</a></h2>
<p>yt-offline runs a <strong>disk-full preflight</strong> and refuses to start a download
when the target filesystem has less than ~500 MB free, surfacing it as a
clear “disk full” failure rather than a half-written file. Free space and
retry.</p>
<h2 id="a-whole-platform-folder-shows-up-as-one-channel"><a class="header" href="#a-whole-platform-folder-shows-up-as-one-channel">A whole platform folder shows up as one “channel”</a></h2>
<p>If you see <code>bandcamp</code>, <code>tiktok</code>, or <code>channels</code> listed as a single channel
in the sidebar, your library directory predates the current layout. All
platforms must <strong>nest under</strong> the one <code>backup.directory</code>
(<code>&lt;dir&gt;/channels/</code>, <code>&lt;dir&gt;/tiktok/</code>, …). Move stray creator folders into
their platform’s subdir; see <a href="./first-run.html#the-library-layout">First run → library layout</a>.</p>
<h2 id="the-desktop-window-crashes-on-maximize"><a class="header" href="#the-desktop-window-crashes-on-maximize">The desktop window crashes on maximize</a></h2>
<p>Older builds crashed with a Glutin <code>EGL_BAD_ALLOC</code> on NVIDIA + Wayland
when maximized. Current builds use the <strong>wgpu (Vulkan)</strong> renderer, which
handles the resize cleanly. Make sure you have a working Vulkan driver
(<code>vulkan-icd-loader</code> + your GPU’s Vulkan package), which any desktop with
working graphics already has.</p>
<h2 id="the-web-ui-looks-like-an-old-version-after-an-upgrade"><a class="header" href="#the-web-ui-looks-like-an-old-version-after-an-upgrade">The web UI looks like an old version after an upgrade</a></h2>
<p>The SPA is served <code>Cache-Control: no-store</code>, so a hard reload
(Ctrl+Shift+R) always picks up the new binary’s UI. If you upgraded the
binary, also <strong>restart the running <code>--web</code> process</strong> — the HTML is baked
into the binary at compile time, so the old process keeps serving the old
UI until restarted.</p>
<h2 id="where-to-look-next"><a class="header" href="#where-to-look-next">Where to look next</a></h2>
<ul>
<li><strong>The job log</strong> — every download/transcode job keeps its full yt-dlp /
ffmpeg output in the Downloads panel (expand the job).</li>
<li><strong><code>yt-offline.crash.log</code></strong> — next to your <code>yt-offline.db</code>. A panic in
any thread (UI, web worker, download) is appended here with a
timestamp, so it survives a GUI launched without a terminal.</li>
</ul>
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