[vorbis-dev] Peeling Specification
segher at koffie.nl
Mon Nov 18 11:01:54 PST 2002
Alan MacDonald wrote:
> Segher Boessenkool wrote:
> > 1) get Ogg packets from Ogg pages
> > 2) throw away parts of the packets (at the end of the packets)
> > 3) reframe into new Ogg pages.
> So were basically talking about making the quantized residue values
> coarser, due to the way they are packed?
That's the main idea of peeling, yes.
> Does it make sense to actually
> use new codebooks, instead of just chopping off the finer values?
That requires recoding, and is much more expensive compute-time wise.
> are the codebooks structured in such a way that chopping a q10 stream
> down to around q5 size, would yield about the same results as recoding
> the residue values with the q5 codebooks?
Nope. That's why peeling doesn't work too well.
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