[FFmpeg-trac] #10956(avfilter:new): colorhold alpha change

[FFmpeg]

#10956: colorhold alpha change
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             Reporter:  Truong Quoc  |                     Type:
  Khanh                              |  enhancement
               Status:  new          |                 Priority:  wish
            Component:  avfilter     |                  Version:
                                     |  unspecified
             Keywords:  colorhold    |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary: I use colorhold for remove all color except one. And alphaextract
 for take alpha.
 But current colorhold only modify bgr, not alpha

 Wish: need option for change alpha

 https://git.ffmpeg.org/gitweb/ffmpeg.git/blob/refs/heads/master:/libavfilter/vf_colorkey.c#l135
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Ticket URL: <https://trac.ffmpeg.org/ticket/10956>
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