[FFmpeg-trac] #9751(swscale:new): Incorrect YUV->RGB24 conversion results on IBM Power9

[FFmpeg]

#9751: Incorrect YUV->RGB24 conversion results on IBM Power9
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             Reporter:  gciaparrone  |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  swscale
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by gciaparrone):

 I attached the black.yuv file produced on the IBM Power9. It has indeed a
 limited range on Y. Converting that file to RGB using the standard
 Altivec-optimized version of ffmpeg produces a "limited range" RGB image,
 while running the exact command on the Power9 with an ffmpeg version
 compiled with --disable-altivec produces the correct black image.

 So there is at least a mismatch in default settings for the two versions,
 or maybe the Altivec optimized version ignores the color range setting.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9751#comment:4>
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