Opened 3 years ago
#10529 new defect
Converting variable frame rate to constant frame rate results in de-synced video
| Reported by: | norbert515 | Owned by: | |
|---|---|---|---|
| Priority: | important | Component: | undetermined |
| Version: | unspecified | Keywords: | |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
Summary of the bug:
Taking a variable frame rate video (such as one recorded from the iOS simulator) and re-encoding it to be fixed framerate results in a video that is not synced to the original. Most noticeably, the animation of opening apps is cut (doesn't happen all of the time)
How to reproduce:
- Record iOS simulator using
% xcrun simctl io booted recordVideo raw.mov
- Run
% ffmpeg -i raw.mov -filter:v fps=60 -fps_mode:v cfr -vsync 1 -copytb 0 ha.mp4
I've tried all permutations of this command; every one produces the same defect.
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