[vorbis] Format converters

[Sebastian Gesemann]

On Sat, 14 Sep 2002, Monty wrote:

> On Mon, Aug 19, 2002 at 01:06:01PM -0100, fungus wrote:
> > On a totally unconnected note....is it not possible
> > to convert from mp3 to vorbis without leaving the
> > frequency domain? That would imply much less loss
> > then converting mp3->wav->ogg.
> 
> It is not possible.  The blocksizes are incompatible.

The problem is the quantizing step to 16 bit while saving
the wav file - NOT the transform, the transform itself isn't
lossy.

Theoretically it's possible to directly take the unquantized
time samples after the mp3 decoding step and feed them into
vorbis codec.

But I think, it isn't worth the effort.

BTW: Monty: I'm still awaiting a statement on the
"gain of high frequencies"-thread in vorbis-dev.
I would be pleased if you can confirm or disprove it.

<p>bye,
Sebastian

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