[FFmpeg-trac] #10989(avfilter:new): "color" video source fails to handle "size=1x1"?

[FFmpeg]

#10989: "color" video source fails to handle "size=1x1"?
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  MasterQuestionable                 |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
             Keywords:  color video  |  master
  source                             |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 ͏    ffmpeg -y -nostdin -nostats -v debug -f lavfi -i
 "color=#ff0000:1x1[0]; color=!#0000ff:1x1[1]; [0][1]vstack,split[0][1];
 [0]vflip,[1]hstack" -vframes 1 -compression_level 10 -pred none "0.png"
 ͏    ffmpeg -y -nostdin -nostats -v debug -f lavfi -i
 "color=#ff0000:1x1,format=rgb24[0]; color=!#0000ff:1x1,format=rgb24[1];
 [0][1]vstack,split[0][1]; [0]vflip,[1]hstack" -vframes 1
 -compression_level 10 -pred none "0.png" -vframes 1 -vf "format=yuvj420p"
 -sws_flags spline+accurate_rnd+full_chroma_int -lossless 1 -q 100
 -compression_level 6 "1.webp"

 ͏    It appears "color" asserts "yuv420p" pixel format: which might be
 problematic (in particular for writing PNG alike).
 ͏    Semantic-wise, it's using RGB notation representing colors: while
 covertly collapsed to subsampled YUV...

 ͏    See also:
 ͏    https://ffmpeg.org/ffmpeg-filters.html#color
 ͏    https://ffmpeg.org/ffmpeg-filters.html#split_002c-asplit
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Ticket URL: <https://trac.ffmpeg.org/ticket/10989>
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