[FFmpeg-trac] #3455(swresample:new): aresample=matrix_encoding=dplii doesn't downmix backleft and center correctly

FFmpeg trac at avcodec.org
Fri Mar 14 22:15:08 CET 2014


#3455: aresample=matrix_encoding=dplii doesn't downmix backleft and center
correctly
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             Reporter:  Peter       |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  swresample
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by Peter):

 I can fix this problem by inverting the back-left channel of my source
 files before letting ffmpeg do its thing - it seems like ffmpeg is
 subtracting the back left from the center channel rather than adding it
 which means it is inverting the back-left when it shouldn't or not
 inverting it when it should.

 I'll do some tinkering over the weekend and see if I can't figure out some
 demonstration to attach.

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Ticket URL: <https://trac.ffmpeg.org/ticket/3455#comment:3>
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