[FFmpeg-trac] #3977(undetermined:new): PNG / watermark files do not work with -vf filter

[FFmpeg]

#3977: PNG / watermark files do not work with -vf filter
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             Reporter:               |                    Owner:
  SeventhCycle                       |                   Status:  new
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  png          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by SeventhCycle):

 Attached are two PNG files. I pulled two from online - in the event that
 the original PNG file I was trying to do this on was corrupt in some way.

 The mov file is from Big Buck Bunny, but I've had the issue with other
 source files as well.

 Please let me know if anything else is needed on your end.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3977#comment:2>
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