[FFmpeg-devel] Multichannel sound resampling

[Frank Barchard]

On Wed, Jul 29, 2009 at 4:29 AM, Michael N. Pritula
<pritula at yandex-team.ru>wrote:

> Hi to all.
> I want to add multichannel audio resampling (at least from multi to
> stereo).
> Is there known problems, wishes?


faad has "downmixing"... you might want to use their algorithm for
consistency at least.
Which is roughly L = (C*.707 + L + Ls*.707) / 3

Keep in mind there are a number of channel layouts, depending on the file
format.

        0   =  WAVE      mapping FL,FR,FC,LFE,SL,SR
        1   =  AC-3, OGG mapping FL,FC,FR,SL,SR,LFE
        2   =  MPEG, DTS mapping FC,FL,FR,SL,SR,LFE


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