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

[Michael Smith]

At 10:31 PM 2/15/01 +0100, you wrote:
>Greetings,
>
>I was wondering some things:
>For a internet radio-station (e.g. using mp3 and hopefully using ogg
>soon), appart from the basic 'streaming' functionallity, there are two
>things that are also important
>- mixing music
>- 'downgrading' a signal to a lower datarate.
>
>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'd be interesting to do so, but I don't think it'd be particularly possible. 

>
>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.

Yes - this is one of the really nice features of the vorbis format. However, tools to do it don't yet exist (they're planned for 1.0, though).

Michael

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