No subject

@media attributes allow for specification of bitrates of the
alternative video sources, so HTML5 probably already specifies all
that is necessary to do bitrate switching. It even seems to me that
Apple have already implemented it since [4] mentions the <video>
element. But it might be a good question to ask on whatwg.

Cheers,
Silvia.

[1] http://www.adobe.com/devnet/flashmediaserver/articles/dynstream_actions=
cript.html
[2] http://www.longtailvideo.com/support/tutorials/Bitrate-Switching
[3] http://www.iis.net/expand/SmoothStreaming
[4] http://developer.apple.com/iphone/library/documentation/NetworkingInter=
net/Conceptual/StreamingMediaGuide/HTTPStreamingArchitecture/HTTPStreamingA=
rchitecture.html#//apple_ref/doc/uid/TP40008332-CH101-SW2