[MPlayer-dev-eng] [PATCH] Automatic downmix

Nicolas George nicolas.george at normalesup.org
Sun Sep 26 10:37:12 CEST 2010

Le quintidi 5 vendémiaire, an CCXIX, Clément Bœsch a écrit :
> Ok I think I get it. So do those values seem fine to you? :

I don't think we need "magical" coefficient that no one knows where exactly
they come from. There may be very elegant and attractive acoustical theory
behind those coefficient, but this theory stops at two practical objections:

- Not all surround files were mastered the same way. There are standards for
  AC3 and a few other formats (and actually, the standard for AC3 defines
  several sets of downmixing coefficients), but if you get a 6-channels
  Vorbis file, you do not which standard it follows.

- MPlayer is a domestic tool, where speakers are placed near the screen
  where there is place and sound reverberates on the furniture in a
  completely uncontrolled way.

Therefore, I do not think more than one significant digit would be relevant
for these coefficients.

If someone calibrated the position of his sofa with regard to his speakers,
he is always free to add the relevant pan filter himself.


  Nicolas George
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