[FFmpeg-trac] #9388(avfilter:new): showwaves filer, very dark output in p2p mode

[FFmpeg]

#9388: showwaves filer, very dark output in p2p mode
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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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 The "p2p" mode in the showwaves filter doesn't work correctly, if the "n"
 option is set to a value larger than 1. If the waveform has a large slope,
 the output becomes very dark, almost invisible. Can be reproduced as
 follows:

 ffmpeg -f lavfi -i sine=100:d=0.2,volume=4 -lavfi
 showwaves=n=4:mode=p2p:s=2205x500 -frames 1 -y out.png
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Ticket URL: <https://trac.ffmpeg.org/ticket/9388>
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