[libav-tools] Downmixing Dolby 5.1 to stereo

Luca Barbato lu_zero at gentoo.org
Thu Sep 11 09:23:28 CEST 2014


On 06/07/14 01:43, Howard Ashreed wrote:
> Hi all,
> I'm trying to reduce the size of an AVI file and am having difficulty
> finding any examples of downmixing Dolby 5.1 audio to stereo. The -af
> argument that seems to have been used with ffmpeg doesn't seem to be
> recognised by avconv, as in the following example:
> 
> -af "aresample=matrix_encoding=dplii"
> 
> Could anyone tell me which options in avconv are the minimum I'd need to
> make stereo from the existing Dolby 5.1 audio track?
> 

I think channelmap[1] is what you are looking for the first example
should be the one you want.

lu

[1]https://www.libav.org/avconv.html#channelmap




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