[vorbis] Vorbis rate and bitrate.

Jack Moffitt jack at xiph.org
Tue Apr 9 10:40:51 PDT 2002

> I want to encode at 64kbps at a 22050 rate ... this is not possible ... why?
> For me it seems a waste of cpu to encode at 64kbps with 44100 sample 
> rate (of course I might be wrong :).
> I saw in the vorbisenc.c that aprox_bitrate_to_vbr returns -1 to every 
> sample rate that is not > 42000 ... is this safe to change ?

Whether you encode at 22.05kHz or 44.1kHz is almost irrelevant.  Vorbis
will lowpass appropriately in either case.  The quality difference
should be negligible.

Unfortunately the case here is that you are just doing it wrong :)  You
are trying to used the bitrate management modes instead of the normal
VBR ones.  If you use -q0 instead of -b64 you'll get the results you


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