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

[FFmpeg]

#7599: Add monochrome/gray pixel format to libaom-av1
-------------------------------------+-----------------------------------
             Reporter:  Ewout        |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avcodec
              Version:  git-master   |               Resolution:
             Keywords:  libaom       |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-----------------------------------

Comment (by Ewout):

 With the following commands FFmpeg doesn't start encoding:
 {{{
 Downloads\ffmpeg-tickets\ffmpeg-7599 -y -i "E:\Morocco8K-8b-1920.y4m" -t
 0.25 -strict -2 -c:v libaom-av1 -pix_fmt gray -cpu-used 4 "E:\Morocco8K-
 8b-gray.mp4"
 Downloads\ffmpeg-tickets\ffmpeg-7599 -y -i "E:\Morocco8K-10b-1920.y4m" -t
 0.25 -strict -2 -c:v libaom-av1 -pix_fmt gray10le -cpu-used 4 "E
 :\Morocco8K-10b-gray.mp4"
 Downloads\ffmpeg-tickets\ffmpeg-7599 -y -i "E:\Morocco8K-10b-1920.y4m" -t
 0.25 -strict -2 -c:v libaom-av1 -pix_fmt gray12le -cpu-used 4 "E
 :\Morocco8K-12b-gray.mp4"
 }}}
 Changing `-pix_fmt ` to `-vf format=` doesn't help. When `-pix_fmt gray`
 is removed or replaced with `-pix_fmt yuv420p` or `-pix_fmt yuv444p` it
 encodes fine.

 This build is used:
 https://mega.nz/#!Y55ACKyA!cUqpJg7CNmjmwgbJNdhETkZWVqTBx_U5_KA2RWXzgpU
 Debug logs attached.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7599#comment:2>
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