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

FFmpeg trac at avcodec.org
Wed Jun 10 15:05:38 EEST 2020

#8724: chromakey does not observe existing transparency
             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            |

Comment (by zerodefect):

 Replying to [comment:1 richardpl]:
 > And why it should? Use two chromakeys and blend filter with or mode for
 alpha plane.

 I'm not experienced with chroma key, so I'll turn that around and ask why
 it shouldn't respect alpha transparency? That is not meant to be a witty

 Can you please elaborate on the solution you propose? I don't understand.

Ticket URL: <https://trac.ffmpeg.org/ticket/8724#comment:2>
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