[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 pdr0):

 It's working as expected

 alphamerge
 https://ffmpeg.org/ffmpeg-filters.html#alphamerge
 "Add or replace the alpha component of the primary input with the
 grayscale value of a second input. "

 The RGB greyscale of mask.png is a circle shape. That replaces the "x"
 character alpha channel in the original main.png

 The RGB channels of "main.png" is green , with some white at the right
 edge, so the expected output is a green circle overlaid on #ff0000
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9626#comment:4>
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