[vorbis] RC2 better than RC3 ???

[Gregory Maxwell]

On Mon, Jan 14, 2002 at 10:09:37PM -0500, Kenneth Arnold wrote:
[snip]
> Coupling is a different story. What exactly will the current channel
> coupling do on (a) more than 2 channels and (b) two channels that have
> nothing to do with each other (like producer commentary, alternate
> language, etc. tracks available on many DVDs)?

The format supports an arbitrary tree of coupled channels. The current
encoder just falls back to uncoupled mode when there are !=2 channels (i.e.
like you encoded them all as separate mono files) because it's unaware of
the coupling geometry.

The decoder should happily decouple things however the encoder coupled them,
but the player will need to know how to map the resulting outputs to the
right speakers.

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