[vorbis] Re: Re: fitting lots of music into 10GB with Vorbis

[Daniel Schregenberger]

 ('binary' encoding is not supported, stored as-is)
James Chapman wrote:

> > someone who actually knows the way the vorbis encoder calculates the
> nominal
> > bitrate would probably find the correct algebraic formula quicker than i
> > could.
> 
> Obviously, being VBR, it's not possible to calculate the average
> bitrate from the quality, the best you can do is give a rough estimate.
> Going from q-1 to q10 the nominal bitrates would be
> {48,64,80,96,112,128,160,192,224,256,320,500} for 44100 stereo.

You may build 11 equations of the form

a + quality * b = bitrate_for_that_quality

and use some math program (matlab, maple, mathematica) or a calculator (HP38,
HP48, TI??, ...) to solve it (in this case to find a & b that fit best). Or you
do it by hand.
For better results use equations of a higher order (eq. a + quality^2 * b +
quality * c = br)

-- Daniel

PS: You maybe have to shift the qualitys by 1, cause it might be better without
a -1
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