[FFmpeg-trac] #4746(swscale:closed): prores alpha blending results in opaque rectangle

[FFmpeg]

#4746: prores alpha blending results in opaque rectangle
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             Reporter:               |                    Owner:
  projectsymphony                    |                   Status:  closed
                 Type:  defect       |                Component:  swscale
             Priority:  normal       |               Resolution:  fixed
              Version:  git-master   |               Blocked By:
             Keywords:  prores       |  Reproduced by developer:  0
  alpha                              |
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by projectsymphony):

 because black when alpha is not visible is the default behaviour for any
 sane player
 try it with quicktime if you don't believe me

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Ticket URL: <https://trac.ffmpeg.org/ticket/4746#comment:21>
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