Pepijn f72b28738a fix(annotate): default keyframe decode to ffmpeg CLI (thread-safe) ...

The decoder chain tried torchcodec first, then ffmpeg. torchcodec is
not thread-safe: under the executor's 16-wide concurrent decode in the
interjections phase it SIGSEGVs (exit 139) before the ffmpeg fallback
is ever reached — uncatchable, so it kills the whole job.

Default the auto chain to ffmpeg only. Per-frame ffmpeg decode runs in
an isolated child process: crash-safe and concurrency-safe (the plan
phase already proved 16 parallel ffmpeg subprocesses are fine).
torchcodec / pyav remain available via an explicit video_backend.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-18 16:40:29 +02:00

..

lerobot

fix(annotate): default keyframe decode to ffmpeg CLI (thread-safe)

2026-05-18 16:40:29 +02:00