[vorbis] bitrtate peeling and lossless compression

[Monty]

On Thu, Mar 22, 2001 at 02:10:44AM -0500, Keith Wright wrote:
> > From: xiphmont at xiph.org (Monty)
> > 
> > On Wed, Mar 21, 2001 at 11:53:49AM -0700, heard wrote:
> > > Could I
> > > theoretically compress my CDs to Vorbis at a rate that is lossless, and
> > > then be able to peel those files to 128k/s or lower for a portable device?
> > 
> > Yes, that's a possible application of the idea...
> 
> But with a catch.  We know from Information Theory 101 that
> there are input sequences that when "losslessly compressed"
> get _bigger_.  Whether any of them are something you want
> to listen to I don't know.

I had assumed he meant 'perceptually lossless', as Vorbis is not truly
lossless in any mode (if for no other reason that FP roundoff).

Monty

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