Playability of individual Blobs produced by a MediaRecorder

My understanding of the spec has always been that individual Blobs produced
by dataavailable events are not necessarily playable individually; i.e. in
order to produce a playable resource, the Web author must concatenate all
the Blobs produced before the done event is fired. The participants in the
discussion of Blob MIME types seemed to share that understanding.

However, I can't see anything in the spec that says this. I think it needs
to be made clear that individual Blobs are not, in general, going to be
playable resources.

Thanks,
Rob
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