[foms] WebM Manifest

[Timothy B. Terriberry]

> will have to be loaded, demuxed and decoded. The demuxing is always
> done in software (ie not hardware) so it is flexible enough to allow

This is not always true. In fact, the hardware people I spoke to at the 
WebM summit seemed genuinely confused why we (browsers) would even want 
to do this in software.

Keep in mind also that TCP does not stop on a dime. If you haven't told 
the remote end where you want to stop receiving data in advance 
(because, for example, you had to download and parse the stream to even 
know where the frame boundaries were), it will blithely continue to 
stuff your channel with data, even if you're no longer interested in it, 
until it receives your CLOSE. That wastes your bandwidth whether you 
like it or not.