Re: [w3ctag/design-reviews] Media Source Extensions for WebCodecs (#576)

@cynthia Glad to hear! Can you elaborate on your questions though? I don't think those questions are relevant to MSE. MSE makes no guarantees about whether media is hardware or software decoded or even anything about how the underlying decoder configurations are managed (intentionally so to allow user agent management of such resources).

The proposed mechanism is only about allowing authors to append already demuxed data into MSE, thereby skipping the demuxing which normally happens implicitly through the byte based append methods. So it's a strict cost reduction mechanism with otherwise no impacts on how MSE functions.

Did y'all have any feedback on whether these new append methods should be added as promise based? Should the interface use the non-promise style (updating, updateend events) for consistency until byte-based promise methods are available? Should we only add the promise based method for chunks once we have a promise based method for bytes?

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