[vorbis] mixing and 'downgrading' of vorbis-files

[Aaron Porter]

> Concerning 'mixing' music, it would be interesting to be able to mix two
> ogg-files without the need to decode and re-encode the files?
> Also, can it be done to mix vorbis-file with different data-rates?

It shouldn't be too hard to have two separate Vorbis streams that get mixed
by the player but I don't think there's any software that does that yet.

>
> Concerning 'datarate downgrading', concider a radio-station doing
> streaming a different data-rates (128 Kbps for cable or ADSL; 80 Kbps for
> dual-band ISDN, 60 Kbps for ISDN, 40 Kbps for modem, ...).
>
> SO, it would be nice to able to 'downgrade' a (say) 128 KBps to the lower
> datarates without having to decode and re-encode the signal.
>

"Bitrate peeling" is planned but AFAIK there are no implementations yet.
>From what I've gathered, the encoder needs to be designed to place the most
significant information at the start of each packet. Then it becomes as
simple as having a server that chops packets according to the desired
bitrate. Can't wait to see it!

Aaron

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