[FFmpeg-trac] #6120(avfilter:new): Transparency ignored in drawbox filter when using the overlay filter

[FFmpeg]

#6120: Transparency ignored in drawbox filter when using the overlay filter
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             Reporter:  est77        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  drawbox,     |               Blocked By:
  transparency, overlay              |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by richardpl):

 This is because drawbox can now draw alpha directly. Use format=yuv444p
 after drawbox to avoid that.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6120#comment:1>
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