[FFmpeg-user] Mixing audio tracks

Nicolas George nicolas.george at normalesup.org
Wed May 23 16:13:10 CEST 2012

Le quintidi 5 prairial, an CCXX, Andrey Utkin a écrit :
> I don't get the point, why i can't merge two mono channels for further
> mixing.

You can. But the stream after merging and before mixing will have two
front-left channels and two front-right channels, this is not a valid
channel layout. af_amerge will therefore pick any channel layout with four
channels and stick it on the stream, just because a channel layout is

Please read the documentation of amerge, it explains that. If you find it
unclear, questions about its wording or suggestions to make it clearer are


  Nicolas George
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