[Libav-user] Odp: Re: Odp: Mixing many video and audio files

Nicolas George george at nsup.org
Mon Mar 31 11:07:26 CEST 2014

Le primidi 11 germinal, an CCXXII, Marcin krycho a écrit :
> sorry but I sent this message almost week ago, I did not know it was not visible on the list.

Your MUA is breaking threads (see the archive on Gmane for example). This is
probably linked. You should fix this

> Thank you for answer. So my understanding is that there are two solutions
> for this problem. First solution is to use amix: filter graph + buffer for
> each input + mixing. Second solution would be to create video file with
> many audio streams with "amerge" and than mix these all channels using
> pan(recomended)?

They are the same solution, with only a slight difference in implementation,
in the way you write the filter graph. The global result is the same: you
feed frames on all inputs and you get a single mixed frame on the output.

> Is there any code example for these two methods? FFMPEG allows to do it,
> so maybe you know where it is implemented in FFMPEG? Which file etc. It is
> not easy to start from scratch with such mixing, this is why I am looking
> for example.

There are examples for filtering audio, although I believe there are no
example for graphs with several inputs.


  Nicolas George

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