Re: [w3ctag/design-reviews] Media Capabilities (#218)

> For example, can we understand if it's possible to efficiently decode more than one video stream at once?

Its not easy to know with current API shape and I haven't thought much about ways the API could be changed for this use case. If you wanted to show 2 videos of same resolution you could approximate by doing a query that doubles the framerate. For sw codecs this is decent. For hw codecs it will depend how the hw resources are divided (e.g. by time slice vs by playback). AFAIK platform decoder APIs don't often surface parallel session limits up front, so this would involve some guessing/learning even for implementers (not a deal breaker). 

> These names imply a guarantee...

We could prefix the names with "ideally" or "typically"... I tend to favor the shorter names though. I expect sophisticated users of the API to understand that nothing is ever guaranteed in media ;).

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