[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:  enhancement  |                   Status:  new
             Priority:  wish         |                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 zerodefect):

 I believe I have the necessary changes to make this work. I'll submit in
 the next few hours using the correct channels.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8724#comment:4>
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