[Bug 23661] 1 video stream requirement would restrict sign-language use cases.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23661

--- Comment #4 from Adrian Bateman [MSFT] <adrianba@microsoft.com> ---
I believe the text proposed by the A11Y TF [1] is inaccurate. Aaron, explained
the changes to allow programmatic change of the kind attribute [2] do not add
new functionality - they merely allow an application to set the value that
might have been provided in a manifest file.

Specifically, Aaron wrote: "The extensions to AudioTrack and VideoTrack have
nothing to do with enabling accessability. They were added to allow kind
information present in a DASH manifest to be reflected by these objects in the
case where the kind information was not present in the initialization segments.
It is not intended to add extra functionality aside from allowing the string
returned from the kind attribute to be changed programatically."

It is important to remember that the scope of MSE is to allow JavaScript
instead of the network to provide media stream data to a HTML5 media element.
The requirements in MSE are to ensure playback of this JavaScript provided
data. Any handling of tracks beyond ensuring basic playability is in not scope
for MSE and should be handled by HTML5. Since MSE has a normative dependency on
HTML5 any changes or clarifications to track handling in HTML5 will be
inherited by MSE. In general, most track processing happens above the layer
that MSE targets, which is abstracting away the network interactions.

The reason the TF agreed to resolve this issue WORKSFORME was not related to
what any implementations might do today but because the TF consensus is that
the MSE spec already says all it needs to say about this matter. Anything else
should be done in HTML5.

This was discussed again on the TF call on 12/17 and the consensus was to stand
by the previous decision. [3]

[1] http://lists.w3.org/Archives/Public/public-html-a11y/2013Dec/0051.html
[2] http://lists.w3.org/Archives/Public/public-html-media/2013Dec/0017.html
[3] http://www.w3.org/2013/12/17-html-media-minutes.html#item03

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Received on Tuesday, 17 December 2013 17:11:17 UTC