[FFmpeg-trac] #7599(undetermined:new): Add monochrome/gray pixel format to libaom-av1

[FFmpeg]

#7599: Add monochrome/gray pixel format to libaom-av1
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             Reporter:  Ewout        |                     Type:
               Status:  new          |  enhancement
            Component:               |                 Priority:  normal
  undetermined                       |                  Version:
             Keywords:  libaom       |  unspecified
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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 Monochrome encoding is supported in AV1 using 4:0:0 chroma subsampling.
 aomenc used the `--monochrome` tag, but instead of an extra option pixel
 formats `gray`, `gray10le` and `gray12le` could also be used.

 Encoding with the gray pixel formats already delivers usable output, but
 the CLI states yuv444p is used.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7599>
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