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does matroska work for streaming?

Yes. Matroska's index is optional, and thus one should be able to stream it simply by omitting the index.

I suspect many existing implementations are suboptimal for streaming though simply because almost nobody uses it that way and so they have not been as tested as they otherwise would be. But this is easy to solve since the format itself already supports streaming.

is there a server and client that supports it? from http://www.matroska.org/technical/guides/faq/index.html Will Matroska be streamable? Yes, but low bitrate streaming like streaming Vorbis, will always be better in Ogg. This is because their design is for different purposes.

They're referring to (at the time it was written) streaming Vorbis using Ogg, which is not at all an unreasonable thing to do. Ogg was originally designed to contain Vorbis, and thus Vorbis-in-Ogg is not particularly evil or difficult to deal with. Ogg only became seriously problematic when they tried to extend it to include things that it wasn't originally designed to be able to do.

Ogg works better.

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