[FFmpeg-trac] #2899(undetermined:new): FFMPEG -af pan not processing 12 channel audio inputs

FFmpeg trac at avcodec.org
Sat Aug 24 17:57:59 CEST 2013

#2899: FFMPEG -af pan not processing 12 channel audio inputs
             Reporter:  hackeron     |                     Type:  defect
               Status:  new          |                 Priority:  important
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Here is a wav file, it is 12 channels: http://itstar.co.uk/test.wav

 I need to be able to get just 1 specific channel out of it with FFMPEG.
 All the documented methods including -af pan and -map_channel are not
 working and producing an empty output file.

 Examples of commands I tried include:

 ffmpeg -i test.wav -af "pan=0x4|c0=c4" -y c4.wav

 ffmpeg -i test.wav -map_channel 0.0.5 -y c5.wav

 for i in 0 1 2 3 4 5 6 7 8 9 10 11; do ffmpeg -i test.wav -af
 "pan=1|c0=c${i}" -y ch${i}.wav; done

 All of the above produce empty/silence output wav files.

 Any ideas?

Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2899>
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