[FFmpeg-trac] #2389(avfilter:new): Inversion audio filter

[FFmpeg]

#2389: Inversion audio filter
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             Reporter:  sun       |                     Type:  enhancement
               Status:  new       |                 Priority:  wish
            Component:  avfilter  |                  Version:  unspecified
             Keywords:            |               Blocked By:
             Blocking:            |  Reproduced by developer:  0
Analyzed by developer:  0         |
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 A filter that inverts selected audio channels would be useful, for example
 to process a balanced signal from an XLR microphone.

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2389>
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