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

[Kristoff Bonne]

Greetings,

On Thu, 15 Feb 2001, Aaron Porter wrote:
>> 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.
Now, the idea would be to mix two vorbis-streams into a new vorbis-stream.

Consider a radio-station streaming in ogg; in which one song is faded out
while the new one is already started or mixing a song with the voice of
the radio-host. (considering his/her voice is encoded into ogg at real
time).
So, how can you avoid loss of quality by not having to decode and
re-encode your signal.

I guess this is more a question concerning the ogg-codec. Is it possible
in the mathymatical model of the codec? 

My question is related to a discussion I had in a radio-related newsgroup;
and the problem of having several 'loosy codecs' in sequence.
(E.g. some guy shows up at a radio-station with a demo of a group on a
minidisk. Usually no problem for FM, but what do you get when your
radio-station broadcasts in MPEG (like DAB or DVB)?

Same question applies here:
What do you get when you have a sequence of mp3 and ogg? (E.g. playing a
ogg-file on a mpeg digital-only (DAB) station?).

Cheerio! Kr. Bonne.

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