[FFmpeg-trac] #9092(avfilter:new): Video corruption when using zscale on M1 Mac

[FFmpeg]

#9092: Video corruption when using zscale on M1 Mac
----------------------------------+--------------------------------------
             Reporter:  galad     |                     Type:  defect
               Status:  new       |                 Priority:  normal
            Component:  avfilter  |                  Version:  git-master
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -ss 00:30 -i test.mp4 -vf
 zscale='primaries=bt709:transfer=bt709:matrix=bt709',format='yuv420p'
 -frames 1 out.png
 ffmpeg commit b410b14
 built on Xcode 12.3
 }}}


 Reproduced on both FFmpeg 4.3 and FFmpeg git-master

 I don't know if this is a FFmpeg issue or a zimg issue, I couldn't
 reproduce it in zimg test-app, but I don' have access to a M1 Mac anymore
 so I can't do any further testing.

 Link to the issue on zimg tracker: https://github.com/sekrit-
 twc/zimg/issues/135

 Screenshot on the wrong output: https://user-
 images.githubusercontent.com/4305519/100336085-06e35280-2fd6-11eb-85cd-
 fc7ac6a1e92f.png

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Ticket URL: <https://trac.ffmpeg.org/ticket/9092>
FFmpeg <https://ffmpeg.org>
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