[FFmpeg-devel] [PATCH] ALSA: implement channel layout for playback.
Carl Eugen Hoyos
Mon Mar 14 12:13:29 CET 2011
Nicolas George <nicolas.george <at> normalesup.org> writes:
> > More difficult is to fix AV_CH_LAYOUT_4POINT0
> > (Edward.Scissorhands.x264.DTS-4.0-48_24.mkv), because it has to be mapped to
> > 5.1 - Alsa's 4-channel layout is AV_CH_LAYOUT_QUAD.
> My opinion is that the output driver should not do that automatically. Using
> an audio filter: "-af layout=5.1", would IMHO be a better solution.
I don't disagree, but if 4 channel output was requested, it should either set
surround to silence or map the back channel to both surround channels. What
should be done with centre in this case?
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