[speex-dev] Mixing audio

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Mon Nov 10 11:32:33 PST 2003

Basically, there's no optimal solution to the problem. Speech codecs
just don't handle mixed streams optimally. So you'll have to do tests
and decide which solution gives you the best results.


Le lun 10/11/2003 à 13:59, Oded a écrit :
> I have received your answer regarding the intention of developing
> audio mix algorithm based on Speex (a while ago...).
> You've mentioned two different scenarios. 
> VOIP applications that can manage with high bit-rates can truly mix
> the audio just once at
> the receiving client. Today most sound cards can mix the decoded
> streams automatically (no need for mix software). 
> The real problem is decoding mixing and than rencoding (where bit-rate
> count...).
> From my experience as a VOIP (and video conference) appication
> developer I still think that mixing few audio streams in software is a
> major problem trying to keep audio quality...

Jean-Marc Valin, M.Sc.A., ing. jr.
LABORIUS (http://www.gel.usherb.ca/laborius)
Université de Sherbrooke, Québec, Canada

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