[FFmpeg-trac] #9761(undetermined:new): broken dynamic size rgba input into rotate

[FFmpeg]

#9761: broken dynamic size rgba input into rotate
-------------------------------------+-------------------------------------
             Reporter:  Jozef        |                     Type:  defect
  Chutka                             |
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  scale        |               Blocked By:
  rotate format                      |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 In latest ffmpeg, `rotate` filter doesnt handle rgba input of a dynamic
 size. The output appears very broken:

 {{{
 ffmpeg -filter_complex
 "color=c=black:size=200x200:rate=30[b];color=c=red:s=100x100,scale=width=n:height=100:eval=frame,format=rgba,rotate=a=n/10:ow=100:oh=100:c=#00000000[r];[b][r]overlay"
 -t 4 -y rgba.mp4
 }}}

 The issue seems to be introduced by `format=rgba`.

 I understand in this particular example `format=rgba` is unnecessary, but
 the provided example is a demonstration of an isolated issue.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9761>
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