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Fix progress reporting and desktop responsiveness during encode

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The progress bar barely moved and the window showed "not responding"
during long encodes: ffmpeg's carriage-return stats line flushes rarely
over a pipe, and the transcode saturated the CPU.

- Drive progress from ffmpeg's structured `-progress pipe:1` output
  (`-stats_period 0.5 -nostats`) and parse out_time/progress in
  process_stdout, giving steady frequent updates (verified ~2/sec via the
  live executor pipe vs ~1 per whole encode before).
- Run the encoder under `nice -n 10` so the compositor keeps a CPU slice
  (avconv gets the nice prefix too).

Also round pad/crop targets to even dimensions and use positive crop
offsets, fixing an odd-height (e.g. 1079) MPEG-2 error surfaced when
burning in subtitles on a 1080p source.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Luna 2026-06-04 04:31:05 -07:00
parent 6cddd72792
commit 7f574897c7
2 changed files with 79 additions and 13 deletions
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23
src/devedeng/avconv.py
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@ -148,6 +148,10 @@ class avconv(devedeng.avbase.avbase):
else:
self.final_length = video_length
self.command_var = []
# lower priority so the desktop stays responsive during the transcode
self.command_var.append("nice")
self.command_var.append("-n")
self.command_var.append("10")
self.command_var.append("avconv")
if start_offset and start_offset > 0:
self.command_var.append("-ss")
@ -228,16 +232,19 @@ class avconv(devedeng.avbase.avbase):
if (file_project.width_midle != file_project.original_width) or (file_project.height_midle != file_project.original_height):
if (cmd_line != ""):
cmd_line += ",fifo,"
x = int((file_project.width_midle -
file_project.original_width) / 2)
y = int((file_project.height_midle -
file_project.original_height) / 2)
# MPEG-2 / yuv420p needs even dimensions; round to even so the
# aspect math can't produce an odd pad/crop target (e.g. 1079).
mid_w = file_project.width_midle - (file_project.width_midle % 2)
mid_h = file_project.height_midle - (file_project.height_midle % 2)
x = int((mid_w - file_project.original_width) / 2)
y = int((mid_h - file_project.original_height) / 2)
if (x > 0) or (y > 0):
cmd_line += "pad=" + str(file_project.width_midle) + ":" + str(
file_project.height_midle) + ":" + str(x) + ":" + str(y) + ":0x000000"
cmd_line += "pad=" + str(mid_w) + ":" + str(
mid_h) + ":" + str(x) + ":" + str(y) + ":0x000000"
else:
cmd_line += "crop=" + str(file_project.width_midle) + ":" + str(
file_project.height_midle) + ":" + str(x) + ":" + str(y)
# crop x/y are the (positive) top-left offset into the source
cmd_line += "crop=" + str(mid_w) + ":" + str(
mid_h) + ":" + str(abs(x)) + ":" + str(abs(y))
if (file_project.width_final != file_project.width_midle) or (file_project.height_final != file_project.height_midle):
if (cmd_line != ""):