[FFmpeg-trac] #3409(undetermined:new): Impossible to transcode full range RGB videos with libx264, and keep full range + proper colors

[FFmpeg]

#3409: Impossible to transcode full range RGB videos with libx264, and keep full
range + proper colors
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             Reporter:  mzso         |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 I encountered this while trying to transcode screencasted videos with
 fraps or ut-video streams.

 When using yuv444p pixel format I get washed out, too light videos.

 "-color_range" has no affect.

 People suggested: "-vf colormatrix=bt601:bt709" But it also doesn't have
 an affect.

 x264 itself has issues with RGB full range videos, if I use i444 with it I
 also get improper output. But if I use "--output-csp rgb" it succeds in
 encoding a proper output file, though with a large file size.
 I can't even achieve this with ffmpeg because it doesn't let me use RGB
 with libx264: "Incompatible pixel format 'rgb24' for codec 'libx264',
 auto-selecting format 'yuv444p'"

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Ticket URL: <https://trac.ffmpeg.org/ticket/3409>
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