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Re: [media] change proposals for issue-152

From: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Date: Thu, 31 Mar 2011 15:22:42 +1100
Message-ID: <AANLkTikSoGrPX3boDGLMdbQj1uBRoJBFSCjyS35ymcrD@mail.gmail.com>
To: Ian Hickson <ian@hixie.ch>
Cc: Mark Watson <watsonm@netflix.com>, "public-html-a11y@w3.org" <public-html-a11y@w3.org>
On Thu, Mar 31, 2011 at 2:30 PM, Ian Hickson <ian@hixie.ch> wrote:
> On Thu, 31 Mar 2011, Silvia Pfeiffer wrote:
>> >
>> > Video is harder since it involves assigning a playback region, so I
>> > agree with the reasoning above for video tracks, more or less. But for
>> > audio tracks it seems exposing them is fine. That's what both
>> > Microsoft's proposal and the MediaController proposal do.
>>
>> Hmm are you suggesting to explicitly expose an audioTracks IDL
>> attribute that has this information? It would be possible...
>
> What I'm proposing is:
>
>   http://www.whatwg.org/specs/web-apps/current-work/complete.html#media-resources-with-multiple-media-tracks
>
>
>> Incidentally, I don't quite buy into the ExclusiveTrackList /
>> MultipleTrackList choice for audio and video tracks in the
>> MediaController API. I think both video and audio tracks should be
>> allowed to have multiple of them active at the same time.
>
> How do you propose that the user agent should render multiple video tracks
> for a <video> element?

My preferred option would be to render them into the video viewport
next to each other (basically into inline css boxes inside the
viewport box). But I am told, UAs render them simply over each other
at the top left corner. In any case, there will be a default rendering
IIUC.

Silvia.
Received on Thursday, 31 March 2011 04:23:35 UTC

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