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It looks like Ogg Vorbis has theoretical support in the spec for something called "Bitrate Peeling"[1], but there is no functional implementation for this yet, and there's been an open bounty on it since 2004.[2]

This is a really neat idea though. Truncating the packet to change the bitrate per client without re-encoding.

[1]: https://en.wikipedia.org/wiki/Bitrate_peeling

[2]: https://wiki.xiph.org/index.php?title=Bounties&diff=196&oldi...

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Peeling has been a goal for many audio/video codecs in the past. Nobody's been able to make it work acceptably, though -- either the low-bitrate version sounds awful, or the high-bitrate version increases in size to the point that it might as well just have a low-bitrate version alongside it.

So in that case you could peel off whichever stream you don’t need, but you waste some upload bandwidth over simply negotiating a bitrate in advance.

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