[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):

 You need to set an option "rematrix_maxval=1.0", otherwise the downmixing
 can exceed 100% and will clip. Its automatically set if you use integer
 formats, so thats why its not happening there.

 This should really be a default, IMHO. Its very unlikely that someone
 wants audio that exceeds 100%, and if they do, they can reset this value
 back to 0.

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Ticket URL: <https://trac.ffmpeg.org/ticket/4564#comment:2>
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