[vorbis] bitrtate peeling and lossless compression
lfenske at yahoo.com
Thu Mar 22 10:19:07 PST 2001
--- ben at slumber.dhs.org wrote:
> 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
> > >
> > > 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.
> This isn't likely to happen with vorbis, since it's never actually
Now I've heard both that lossless is possible and that it's not. It would be
wonderful if it were possible. I could peel back depending on the device I
want to play on, and still be able to re-create the original in a year or ten
to re-encode with the (by then) new and improved vorbis. Now, I'm saving both
the original wave file and the ogg or mp3 file. I've hesitated re-encoding all
my waves into ogg because it's still undergoing rapid improvement. If I could
encode into ogg, throw away the wave (even if some oggs are slightly larger),
then re-encode later I would be ecstatic (as far as digital audio goes anyway).
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