[FFmpeg-trac] #11182(swscale:closed): yuvtestsrc and yuv444p->rgba->yuv444p conversion result in huge difference

[FFmpeg]

#11182: yuvtestsrc and yuv444p->rgba->yuv444p conversion result in huge difference
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             Reporter:  Andrew-R     |                    Owner:  (none)
                 Type:  defect       |                   Status:  closed
             Priority:  normal       |                Component:  swscale
              Version:  unspecified  |               Resolution:  invalid
             Keywords:  colorspace   |               Blocked By:
  color_primaries                    |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Balling):

 >Honestly, until now I was under impression RGB was superset of YUV, not
 other way around ... I was wrong!

 You just read one small text in
 ​https://stackoverflow.com/questions/17892346/how-to-convert-rgb-yuv-rgb-
 both-ways "Since the 8 bit YUV only uses Y values [16, 235] and U, V
 values [16, 240] it has less possible colors than RGB using [0, 255].",
 which is simply not true, there is a comment from me under that answer
 that says: It is not on any flagship TV. If you send YCbCr it will show
 superwhite and supercolors no problem. In some cases even xvYCC. LG C9
 does it even in internal files player."
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Ticket URL: <https://trac.ffmpeg.org/ticket/11182#comment:35>
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