[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):

 Replying to [comment:5 Balling]:
 > Try
 >
 > ffmpeg -s:v 64x64 -pix_fmt yuv420p -i black.yuv -frames:v 1 -vf
 scale=in_range=tv:out_range=pc:flags=accurate_rnd,format=rgb24
 reblack1.png


 This command keeps outputting the wrong image. But I have noticed
 something weird: the image is not entirely made of [16, 16, 16] pixels.
 There is a thin band on the bottom of the image with the correct pixels
 ([0, 0, 0]). This is also true of the original reblack.png image I posted.
 So something weird is going on.

 >
 > Also try
 >
 > ffmpeg -s:v 64x64 -pix_fmt yuv420p -i black.yuv -frames:v 1 -vf zscale
 reblack1.png
 >
 > For last command zimg should be compiled in.
 >
 > Limited range RGB was prohibited in ffmpeg back in 2021, PNG does not
 support it anyway.

 I will try to recompile ffmpeg as soon as I can and test this out.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9751#comment:6>
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