[FFmpeg-trac] #11070(avfilter:new): showwaves filter doesn't work any more

[FFmpeg]

#11070: showwaves filter doesn't work any more
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             Reporter:  Michael      |                     Type:  defect
  Koch                               |
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 This is an example from chapter 3.48 in my book:
 http://www.astro-electronic.de/FFmpeg_Book.pdf
 I'm sure it did work some time ago, when I wrote this chapter. Now it
 doesn't work any more. The output is only a line.

 rem  Create a sample waveform:

 ffmpeg -f lavfi -i sine=250:b=2 -t 0.2 -y sine.wav

 rem  Convert the waveform to an image:

 ffmpeg -i sine.wav -lavfi showwaves=n=15:mode=p2p:draw=full -frames 1 -y
 waveform.png
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Ticket URL: <https://trac.ffmpeg.org/ticket/11070>
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