Cannot copy vp9 stream from webm to mp4
|Reported by:||yrrqxk||Owned by:|
|Blocking:||Reproduced by developer:||no|
|Analyzed by developer:||no|
Summary of the bug:
I cannot copy the stream of this webm to an mp4 container. It can be copied to another webm and re-encoded to either webm or mp4 without issue.
Copying this stream to another webm seems to also copy the defect as trying to copy from one webm to another then copy to mp4 results in the same error. This even happens with clips from affected files as you can see in the attached file.
If this is relevant, the files are produced by youtube-dl and the issue only seems to happen when the video was in DASH format. This has been an issue for some time (months) across multiple youtube-dl versions and ffmpeg versions.
How to reproduce:
ffmpeg.exe -i test.webm -c copy test.mp4 ffmpeg version: 2021-01-20-git-2021dbe1d6-full_build-www.gyan.dev