[FFmpeg-trac] #10430(swscale:new): Wrong yuv420p to rgb24 result on macOS m1 arm64

[FFmpeg]

#10430: Wrong yuv420p to rgb24 result on macOS m1 arm64
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             Reporter:  lja      |                    Owner:  (none)
                 Type:  defect   |                   Status:  new
             Priority:  normal   |                Component:  swscale
              Version:  6.0      |               Resolution:
             Keywords:  yuv2rgb  |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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Comment (by Balling):

 >generated the sample video sample_gray_100.avi from a constant gray value
 RGB[100,100,100] (0x646464 in hex).

 You need 10 bit YCbCr to preserve 8 bit RGB.

 >confirmed that playing the video on VLC for both architectures display
 the same correct output of the expected constant gray 0x646464 value.

 You cannot. VLC has a lot of bugs, that makes tbis impossible. You need to
 use mpv.

 >can see that for both archs the frame YUV value is the same [102 128 128]

 It is 420, not 444. So how can it be, not all pixels have all components?
 But sure, 102 will decode to 100 in full RGB.

 >P.S: Could this be related to #979 ?

 No, that happens on with bgr from 420 and vice versa.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10430#comment:1>
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