[FFmpeg-trac] #8724(avfilter:new): chromakey does not observe existing transparency

[FFmpeg]

#8724: chromakey does not observe existing transparency
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             Reporter:  zerodefect   |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:  chromakey,   |               Blocked By:
  alpha                              |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by richardpl):

 And why it should? Use two chromakeys and blend filter with or mode for
 alpha plane.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8724#comment:1>
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