[FFmpeg-trac] #3977(undetermined:closed): 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:  closed
                 Type:  defect       |                Component:
             Priority:  normal       |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:               |  worksforme
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by Timothy_Gu):

 @!SeventhCycle: If you could do a git bisect to find out which commit
 fixed the issue so we can backport it, it would be the best. However,
 remember to put the current HEAD as "bad" and the n2.4.1 tag as "good" as
 we are looking for a commit that fixes this bug, not breaks something.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3977#comment:9>
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