[whatwg] On implementing videos with multiple tracks in HTML5
ian at hixie.ch
Mon Apr 30 21:27:01 PDT 2012
On Fri, 20 Aug 2010, Silvia Pfeiffer wrote:
> Three issues I have taken out of this discussion that I think are still
> open to discuss and potentially define in the spec:
> * How to expose in-band extra audio and video tracks from a multi-track
> media resource to the Web browser? I am particularly thinking here about
> the use cases Lachlan mentioned: offering stereo and surround sound
> alternatives, audio descriptions, audio commentaries or multiple
> languages, and would like to add sign language tracks to this list. This
> is important to solve now, since it will allow the use of audio
> descriptions and sign language, two important accessibility
I think this is now resolved. Let me know if there's still something open
> * How to associate and expose such extra audio and video tracks that are
> provided out-of-band to the Web browser? This is probably a next-version
> issue since it's rather difficult to implement in the browser. It
> improves on meeting accessibility needs, but it doesn't stand in the way
> of providing audio descriptions and sign language - just makes it easier
> to use them.
I'm not sure what you mean here.
> * Whether to include a multiplexed download functionality in browsers
> for media resources, where the browser would do the multiplexing of the
> active media resource with all the active text, audio and video tracks?
> This could be a context menu functionality, so is probably not so much a
> need to include in the HTML5 spec, but it's something that browsers can
> consider to provide. And since muxing isn't quite as difficult a
> functionality as e.g. decoding video, it could actually be fairly cheap
> to implement.
I agree that this seems out of scope for the spec.
Ian Hickson U+1047E )\._.,--....,'``. fL
http://ln.hixie.ch/ U+263A /, _.. \ _\ ;`._ ,.
Things that are impossible just take longer. `._.-(,_..'--(,_..'`-.;.'
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