Document the hardsub/auto-split fork

Add FORK_NOTES.md describing the new features, a README pointer, and keep
the known-good baseline encoder as contrib/dvd-safe-converter.sh (the
reference the Compatibility profile is modelled on).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

FORK_NOTES.md

@@ -0,0 +1,66 @@
+# DeVeDe-NG — Hardsub & Auto-split Fork
+
+This is a fork of [DeVeDe-NG](https://gitlab.com/rastersoft/devedeng) that adds
+three things aimed at producing burn-ready NTSC DVDs from arbitrary video files:
+
+1. **Embedded subtitle detection + hardsubbing (burn-in).**
+2. **Selectable DVD encode profiles** (Compatibility / High quality / Custom).
+3. **Automatic splitting of over-long projects across multiple ISOs / DVD-Rs.**
+
+The baseline encode is modelled on the known-good script in
+[`contrib/dvd-safe-converter.sh`](contrib/dvd-safe-converter.sh).
+
+## 1. Hardsubbing embedded subtitles
+
+The analyzer (`ffprobe` / `avprobe`) now detects embedded subtitle tracks and
+classifies each as **text** (SubRip/ASS/mov_text/WebVTT) or **image**
+(PGS/VOBSUB/DVD subtitle). In a movie's *Subtitles* properties page a
+**"Burn in embedded subtitle"** dropdown lets you pick one track to render
+permanently into the picture.
+
+- **Text** subs are burned with ffmpeg's `subtitles=` (libass) filter, applied
+  after scaling to the DVD size.
+- **Image** subs are composited with an `overlay` filtergraph *before* scaling,
+  so bitmap positioning stays aligned with the source frame. (OCR-to-text is an
+  optional future enhancement; the default overlays the bitmap directly.)
+
+Burned-in subtitles are part of the video; the existing *soft* subtitle support
+(spumux subpicture streams from external files) is unchanged.
+
+## 2. Encode profiles
+
+A project-level **Encode profile** selector (next to the disc-size control,
+DVD only):
+
+| Profile | Video | Audio | Notes |
+| --- | --- | --- | --- |
+| **Compatibility (4500k)** | CBR 4500k | AC3 192k | Old-player safe baseline (~133 min / single-layer disc). |
+| **High quality (fill disc)** | VBR, fills disc | AC3 448k | Best quality per disc. |
+| **Custom** | user kbps | user kbps | Advanced; clamped to stay within DVD spec. |
+
+NTSC DVD audio is AC3 for all profiles (the upstream default was MP2 for NTSC),
+matching the baseline script and maximising player compatibility.
+
+## 3. Splitting long projects across discs
+
+Usable disc capacity is taken from the selected disc size (with the existing
+~10% safety margin). When a project does not fit on one disc at the chosen
+quality, you are asked whether to:
+
+- **Split into N discs** — keep the quality and author one DVD/ISO per disc
+  (`name-disc1.iso`, `name-disc2.iso`, …), **or**
+- **Reduce bitrate** — squeeze everything onto a single disc (the original
+  behaviour).
+
+Multiple titles are distributed across discs whole. A single movie that is
+itself larger than one disc is split by time at the **chapter boundary nearest**
+each disc's capacity (falling back to an even time cut when the movie has no
+chapters). Split discs are authored without a menu — each disc plays its
+segment(s) directly.
+
+### Limitations
+
+- Split discs have no DVD menu.
+- Burning is per-disc: the app produces the ISOs; burn each in turn.
+- Image-subtitle burn-in is supported by the ffmpeg backend; the avconv backend
+  handles text subtitles only.

README.md

@@ -1,5 +1,10 @@
 # DEVEDE NG #
 
+> **Fork note:** This tree is a fork of DeVeDe-NG that adds embedded-subtitle
+> **hardsubbing** (burn-in), selectable DVD **encode profiles**, and automatic
+> **splitting of long projects across multiple ISOs/DVD-Rs**. See
+> [FORK_NOTES.md](FORK_NOTES.md) for details.
+
 ## WHAT IS IT? ##
 
 Devede NG is a rewrite of the Devede DVD disc authoring program. This new

contrib/dvd-safe-converter.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+# Reference "DVD-safe" NTSC MPEG-2 encoder.
+#
+# This is the known-good baseline that the DeVeDe-NG hardsub fork's
+# "Compatibility (4500k)" encode profile is modelled on. It is kept here as a
+# standalone tool and as a regression reference: the fork's generated ffmpeg
+# command for the Compatibility profile (without subtitle burn-in) should
+# produce equivalent output (mpeg2video / 720x480 / 29.97fps / AC3 192k 48kHz).
+#
+# It does NOT detect or burn subtitles and does NOT split long movies; those
+# features live in the GUI fork (see FORK_NOTES.md).
+
+if [ $# -lt 1 ]; then
+  echo "Usage: $0 input_video"
+  exit 1
+fi
+
+INPUT="$1"
+BASENAME="$(basename "$INPUT")"
+NAME="${BASENAME%.*}"
+OUTPUT="${NAME}-dvdsafe.mpg"
+
+echo "Input:  $INPUT"
+echo "Output: $OUTPUT"
+echo "Encoding DVD-safe MPEG-2 (CBR 4500k)..."
+
+ffmpeg -y -i "$INPUT" \
+-vf "scale=720:480:flags=lanczos,\
+fps=30000/1001,\
+format=yuv420p,\
+setsar=1" \
+-r 30000/1001 \
+-c:v mpeg2video \
+-b:v 4500k \
+-minrate 4500k \
+-maxrate 4500k \
+-bufsize 1835k \
+-g 15 \
+-sc_threshold 0 \
+-pix_fmt yuv420p \
+-c:a ac3 \
+-b:a 192k \
+-ar 48000 \
+-ac 2 \
+"$OUTPUT"
+
+echo "Done: $OUTPUT"