#5096: video range shifted at high bit depth video transcoding
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Reporter: Thomas Mundt | Owner:
Type: defect | Status: new
Priority: normal | Component: avfilter
Version: git-master | Resolution:
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Thomas Mundt):
I continued testing and discovered that it is the auto inserted scaler
which does the range shift. The effect can be increased by cascading
format changes in the video filter. Just transcode one of my input files
to an arbitrary output codec with following video filter:
-vf "format=pix_fmts=yuv420p, format=pix_fmts=yuv422p,
format=pix_fmts=yuv420p, format=pix_fmts=yuv422p"
This problem didn´t appear with old ffmpeg v2.2.
I found the patch that involved the issue:
[http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=4959a4fcf76e7c595dbb23c4e3bf59abf2e60ea4]
When I withdraw the changes in git master the range shift is gone.
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Ticket URL: <https://trac.ffmpeg.org/ticket/5096#comment:1>
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