[FFmpeg-trac] #7368(avfilter:new): showspectrumpic set background color?

[FFmpeg]

#7368: showspectrumpic set background color?
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             Reporter:  Sparktank    |                    Owner:
                 Type:  enhancement  |                   Status:  new
             Priority:  wish         |                Component:  avfilter
              Version:  git-master   |               Resolution:
             Keywords:               |               Blocked By:
  showspectrumpic                    |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
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Comment (by Sparktank):

 Yes. It'd be different if we can use transparent as color.
 This would give us opportune ideas to use it more than a spectrogram.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7368#comment:3>
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