[FFmpeg-trac] #4564(swresample:new): Distortion after flt stereo downmix

[FFmpeg]

#4564: Distortion after flt stereo downmix
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             Reporter:  cehoyos     |                    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 heleppkes):

 I tested with the provided sample, and rematrix_maxval=1.0 fixes the
 problem. The output gets quiter, and the artifacts vanish.

 Its also visible in the debug output, as the mixing matrix changes from:
 1.000000 0.000000 0.707107 0.000000 0.707107 0.000000
 0.000000 1.000000 0.707107 0.000000 0.000000 0.707107

 to:
 0.414214 0.000000 0.292893 0.000000 0.292893 0.000000
 0.000000 0.414214 0.292893 0.000000 0.000000 0.292893

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Ticket URL: <https://trac.ffmpeg.org/ticket/4564#comment:4>
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