[FFmpeg-user] More on audio stream mapping

Tim Nicholson tim.nicholson at bbc.co.uk
Mon Dec 19 09:02:43 CET 2011

On 17/12/11 09:08, Clément Bœsch wrote:
> On Fri, Dec 16, 2011 at 12:11:50PM +0000, Tim Nicholson wrote:
>> I have a file containing 1 video and 4 mono audio streams, and wish
>> to create a file with 1 video and 2 stereo audio streams.
>> [....]
> You can't unfortunately ATM have an output stream composed of multiple
> input streams (internally an output stream is associated with only one
> input stream); I though I added a note in the documentation, but my
> wording is certainly approximative as ever.

I wasn't entirely sure, which is why I made this post. I will add it to 
the list of things to look at when I have a go at tidying up the docs..

> But this might be possible through the filters when the merge filter will
> be upstream (there is a pending patch on the mailing list). One could also
> write some stream preprocessing code to merge the streams.
> Anyway, you just hit a limitation...

OK thanks for the clarification Clément


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