[FFmpeg-trac] #6790(avfilter:open): Pan filter outputs silence when used without channel layout

FFmpeg trac at avcodec.org
Wed Feb 14 17:38:50 EET 2018


#6790: Pan filter outputs silence when used without channel layout
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             Reporter:  t.rapp      |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avfilter
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  0           |
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Comment (by t.rapp):

 Similar problem occurs when output channel layout is defined but input
 channel layout is undefined:

 {{{
 % ./ffmpeg -guess_layout_max 0 -i tests/data/asynth-44100-2.wav -f wav
 -filter:a "pan=mono|c0=c0+c1" -y ../temp/ffmpeg-pan-test02.wav -loglevel
 repeat+verbose)
 }}}

 Also in this case the pan filter outputs silence instead of actual data.

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Ticket URL: <https://trac.ffmpeg.org/ticket/6790#comment:2>
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