[FFmpeg-trac] #9626(undetermined:new): alphamerge and transparency in main

[FFmpeg]

#9626: alphamerge and transparency in main
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             Reporter:  Jozef        |                    Owner:  (none)
  Chutka                             |
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Michael Koch):

 > When alphamerge alpha has white pixels where in has transparent, those
 are expected to result transparent on out, however ffmpeg renders it with
 some(?) color.

 It's the other way round. Black pixels become alpha=0 and that's
 transparent. White pixels become alpha=255 and that's opaque.
 In my opinion the output of the alphamerge filter is correct, and the
 output of the overlay filter is also correct.

 Michael
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Ticket URL: <https://trac.ffmpeg.org/ticket/9626#comment:2>
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