ML retiming inserts frame from previous file when batch processing (FCP, Compressor)

Thank you joema. I was able to reproduce it on an M1 Pro (with the same macOS, Compressor, and FCP versions).

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If it helps, I wrote this little tool for detecting the stray frames and printing their timestamps.

brew tap ericfortis/fcpscene
brew install fcpscene


cd ~/Movies/video_foo
for f in *.mov; do
  cuts=$(fcpscene --quiet --min-scene-seconds 0 --mode list "$f")
  if [[ $cuts ]]; then
    echo "$f" "$cuts"
  fi
done

video_foo_018.mov 0.0166667
video_foo_064.mov 0.866667 2.066667
video_foo_073.mov 0.866667 2.066667

Those `video_foo*` above are 25fps 1080p.

On the other hand, 30fps 4K videos seem to have the issue at 4.10000 and 8.20000 (not always but highly consistent). Can't confirm, but I think the issue is not reproducible in videos under 4seconds long.

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My current workaround is using this AppleScript below, which schedules one video at a time, and waits for "TranscodeService" not to exist before starting each job.

This way I don’t see the stray frames. Although I had to add a two-seconds delay after "TranscoderService" ends.

https://github.com/ericfortis/final-cut-pro-automation/blob/main/batch-compressor-droplet.applescript