[speex-dev] Speex and Jabber

Jean-Marc Valin Jean-Marc.Valin at USherbrooke.ca
Fri Apr 23 12:33:13 PDT 2004

> I'm working with the Helix-Jabber project to create a standard for voice and 
> video with Jabber IM (http://jabber.org).  I've received numerous 
> recommendations about Speex, and so for our standard voice codec, I'm 
> wondering if it would be wise to choose Speex instead of GSM.  The codecs we 
> choose must be accessible to as many developers as possible.

I definitely think you should use Speex instead of GSM. Speex has much
higher quality (for the same bit-rate) and supports many features that
GSM doesn't have, such as a wide range of bit-rates (as well as variable
bit-rate) and multiple sampling rate (8,16,32 kHz). It is also more
robust to packet loss as encountered with RTP.

> Also, a major requirement is that the codec be available for use with RTSP 
> (RFC 2326).  This generally means being transmittable via RTP packets and 
> having a standard mime-type.  Has any effort been made in this direction?

Speex was designed so it could be used efficiently with RTP. We have a
IETF draft for Speex in RTP which is available at:


Jean-Marc Valin
Université de Sherbrooke, Québec, Canada

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