[FFmpeg-trac] #9686(undetermined:new): drawbox breaks dynamic size

[FFmpeg]

#9686: drawbox breaks dynamic size
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Elon Musk):

 One issues is that auto inserted scale filter does not use eval=frame but
 eval=init and there is no way to change that via ffmpeg tool. And because
 you use format conversion filters drawbox that supports only yuv and not
 packed rgb formats auto inserts scale filter.

 Will look into adding rgb support to drawbox filter.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9686#comment:5>
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