[FFmpeg-trac] #8563(undetermined:new): overlay filter with simple PNG adds black fringe

[FFmpeg]

#8563: overlay filter with simple PNG adds black fringe
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             Reporter:  quasor       |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  4.2          |               Resolution:
             Keywords:  ffmpeg       |               Blocked By:
  overlay                            |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Gyan):

 Of note here is that libavfilter inserted auto scalers to convert rgba
 formatted inputs to yuva420p despite the former being acceptable formats
 in overlay.

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Ticket URL: <https://trac.ffmpeg.org/ticket/8563#comment:2>
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