[FFmpeg-trac] #7543(avfilter:new): showwavespic complex filter with alphamerge never completes

[FFmpeg]

#7543: showwavespic complex filter with alphamerge never completes
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             Reporter:  ajbeach2    |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:  waveform    |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by Gyan):

 Reproduced here.

 Workaround is

 {{{

 ffmpeg -v verbose -y -vn -i song.mp3 \
     -filter_complex \
        "[0:a]aformat=channel_layouts=mono,compand=gain=-6, \
         showwavespic=s=600x120:colors=white,negate,format=gray[a]; \
         color=black:600x120,format=yuv444p[c]; \
         [c][a]mergeplanes=0x00010210:format=yuva444p" -vframes 1 song.png
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/7543#comment:2>
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