A whole-file mp4 index grows with the frame count; for a many-hour video
it reaches tens of MB, which a phone must fetch and parse before the
first frame, and every seek walks it. `fragmented` writes the file with
-movflags +frag_keyframe+empty_moov+default_base_moof+global_sidx and
10s fragments: a ~1 KB moov plus a global seek index, so playback starts
and seeks quickly. mp4/m4a only; a remux, so it takes seconds per GB.
Measured on an 11-hour h264/aac file: moov 40 MB -> 1.4 KB, seek index
2 x 120 KB, 10k fragments, duration and codecs unchanged, remux in 25s.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Review fixes. The temp output was only removed on Exception, but a
cancelled Job's run_command raises CancelledError (a BaseException), so a
cancel left the partial file for a refresh to index. Closing the modal
during a Job that then failed showed nothing; it now toasts the error
(and a cancellation). Polling gives up on a 404 or five failures in a
row (the API restarted and forgot its Jobs), warning the user and
unlocking Transcode and Delete instead of reading Transcoding... forever.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
After ffmpeg exits, the output is probed and compared with the source
(container, presence of video/audio streams, codec per stream, duration
within 1s or 1%) and its last 30 seconds are decoded to a null output.
Any failure removes the output and keeps the original.
The tail decode replaces the download-time completeness check, which
grabbed a single frame near the end: one ffmpeg_video_complete (sync for
the downloader, async for Jobs) now serves both, and is stricter, since
every frame of the tail plus the audio must decode.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Keeping both streams is no longer refused: ffmpeg copies them into the
chosen container with fast start. The container select starts at the
file's own container, the hint explains what a remux does, and the button
reads Remux when nothing is re-encoded.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
* videos: codec download preferences with transcode and strict-fail options
Add video_codecs/audio_codecs ordered preference lists to the video,
channel, and RSS downloaders, alongside the existing resolution
selector. Codec preference is codec-major: a preferred codec at a
lower resolution beats another codec at a higher resolution.
When 'transcode' is enabled, a downloaded file whose streams do not
match the preferences is re-encoded with ffmpeg after download (only
the mismatching stream; targets are extensible maps, currently h264
and aac/opus/mp3). When 'strict_codecs' is enabled and transcode is
not, a download with no matching format fails permanently instead of
falling back.
Empty codec lists produce a byte-identical yt-dlp command to before.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* videos: honor strict_codecs when transcode cannot produce the preference
Review fixes:
- strict_codecs is now suppressed only when transcoding can produce a
preferred codec for every non-empty preference list (new
transcode_can_satisfy_codecs); av1-only preferences with transcode
enabled fail under strict instead of silently keeping the file.
- No partial transcode: an unfixable video mismatch blocks an
audio-only conversion (and vice versa); the mismatch falls through
to strict/keep.
- fsync the transcode output before rename, and the directory after,
so power loss on a Pi cannot leave a truncated final file.
- mp3 yt-dlp pattern matches mp4a.6B as well as mp4a.6b.
- ffmpeg maps use 0:V:0 (excludes attached pictures) and 0🅰️0?
(tolerates missing audio).
- Strict toggle is no longer disabled by transcode in the UI; popup
wording corrected.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* videos: serialize transcodes machine-wide via shared_ctx lock
Sanic runs multiple worker processes, so an asyncio primitive cannot
serialize transcodes across download workers. A multiprocessing.Lock
in shared_ctx now guarantees only one ffmpeg transcode runs at a time
on the machine; waiting workers poll the lock asynchronously so the
event loop stays responsive while a transcode holds it for hours.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* videos: transcode-lock review fixes
- Document that a crashed lock holder requires an API restart; this is
accepted rather than adding owner-death recovery.
- Move the 'Transcoding' user notification to after the lock is
acquired, so it fires when work begins rather than before a
potentially hours-long wait.
- Soften the lock test docstring to what it measures (in-process
wait/release); trim the acquire docstring to the polling rationale.
- Give transcode_lock its own section header in contexts.py.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---------
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
