[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 Jozef Chutka):

 Hi Michael,
 please check the attachments I included. I am trying to mask semi
 transparent image containing "X" by mask in "O" shape. I would really
 expect output to respects my transparent pixels in the original X.
 However, instead, some very unexpected green pixels appear, where are
 these coming from?
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Ticket URL: <https://trac.ffmpeg.org/ticket/9626#comment:3>
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