#8735: videotoolbox causes chroma artifacts in comparison to sw decoding
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Reporter: der_richter | Owner:
Type: defect | Status: new
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: videotoolbox | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by der_richter):
this is again a question only someone can answer that knows the internals
of ffmpeg and the limitations of the videotoolbox API. since i don't know
what the videotoolbox API exactly returns i can only guess. though it
looks like wrongly sampled chroma planes.
as a test i reencoded the file to a format that the quicktime player can
decode and playback. https://0x0.st/iW-I.mp4
this file also has the same problem as mentioned above, though with
quicktime player the artifacts are a lot less pronounced. see screenshot
below. i also verified that it used hwdec/videotoolbox for decoding. so if
Apple doesn't use a private API it should be possible to fix or lessen the
problem considerably.
[[Image(https://0x0.st/iW-l.png)]]
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Ticket URL: <https://trac.ffmpeg.org/ticket/8735#comment:3>
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