[speex-dev] --dtx alone does nothing?

Jean-Marc Valin jean-marc.valin at hermes.usherb.ca
Tue Jan 14 18:46:35 PST 2003


> So there should be some equivalency between --abr values and --quality
> values?  Or do they effect the rate in different ways.

Actually, --abr adjusts the quality in real-time so that the average
bit-rate meets a certain target. with just --quality, the final average
bit-rate is dependent on the data, so that's why --abr is there.

> I'm still confused as to all of the different ways to specify the bit rate/
> quality of an encoding.  Could you enumerate the valid combinations of
> switches?

Basically, you have CBR and VBR and you can specify either quality or
bit-rate, so:

CBR+quality  = --quality <int>
VBR+quality  = --vbr --quality <float>
CBR+bit-rate = --bitrate <int>
VBR+bit-rate = --abr <int>

        Jean-Marc


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

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