[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:               |                     Type:  defect
  SeventhCycle                       |                 Priority:  important
               Status:  new          |                  Version:  git-
            Component:               |  master
  undetermined                       |               Blocked By:
             Keywords:  png          |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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 Hello,

 Summary of bug:
 It appears that newer versions of FFmpeg do not allow PNG files to be
 specified within the -vf (video filter command).

 How to reproduce:

 ffmpeg -y -i big_buck_bunny_1080p_h264.mov \
 -b:v 3000k -vcodec h264 -t 30 -acodec aac -strict experimental -ab 128k \
 -vf "movie='sample-128.png' [wm]; [in] [wm] overlay=W-w-10:H-h-10 [out]" \
 "outtest.mp4"

 I was able to reproduce this with:

 FFmpeg 2.4
 FFmpeg 2.4.1
 ffmpeg version N-40926-g303fc9b

 The exact same command works when replacing the PNG file with a JPEG file.

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