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RE: Action-219: Draft Response to MSE on Bug 23661

From: Paul Cotton <Paul.Cotton@microsoft.com>
Date: Thu, 12 Dec 2013 16:54:14 +0000
To: "Aaron Colwell <acolwell@google.com> (acolwell@google.com)" <acolwell@google.com>, Adrian Bateman <adrianba@microsoft.com>, Mark Watson <watsonm@netflix.com>
CC: "public-html-media@w3.org" <public-html-media@w3.org>
Message-ID: <67d0a18879b4445d98d40cdb94676423@BL2PR03MB418.namprd03.prod.outlook.com>
FYI.    The original message on the A11Y TF list is:

Basically the A11Y TF would like the Media TF to consider adding a non-normative note to MSE to cover the use case described in Bug 23661.  Note that the TF is also working on opening a bug on HTML5 to ensure this item is covered there as well.

I will add this item to the Media TF agenda for Tue Dec 17 but I encourage the Editors to review this item ASAP.


Paul Cotton, Microsoft Canada
17 Eleanor Drive, Ottawa, Ontario K2E 6A3
Tel: (425) 705-9596 Fax: (425) 936-7329

-----Original Message-----
From: Janina Sajka [mailto:janina@rednote.net] 
Sent: Wednesday, December 11, 2013 11:49 PM
To: HTML Accessibility Task Force
Subject: Action-219: Draft Response to MSE on Bug 23661


Herewith, a proposed response to the HTML-WG's Media Task Force and our comments on their MSE specification as provided in Bug 23661:

MSE Specification:

The HTML-A11Y Task Force has previously discussed our willingness to accept the Media Task Force assertion (in response to Bug 23661) that the javascript approach detailed in the MSE specification is sufficient to meet accessibility requirements for alternative media, and especially for simultaneous video streams as is required to support Sign Language Translation http://www.w3.org/TR/media-accessibility-reqs/#sign-translation

The HTML-A11Y Task Force believes it important, however, that the core technical specification implementing media support in HTML 5 explicitly acknowledge both the alternative media requirements and the sufficiency of its specification to successfully deploy multiple media streams, especially multiple video streams, to users who require alternative media.

We propose, therefore, a brief note in the introductory section of the MSE specification stating:

	"NOTE: This specification directly supports multiple tracks. It
	explicitly extends the AudioTrack and VideoTrack interfaces to
	allow programmatic control of track kind to enable ,a
	Media</a> scenarios, including simultaneous multiple video
	tracks in support of <a
	Language Translation video tracks</a>."

The Task Force recalls that our requirements for alternative media support were conveyed to the wider HTML-WG in 2010:



Janina Sajka,	Phone:	+1.443.300.2200
		Email:	janina@rednote.net

Linux Foundation Fellow
Executive Chair, Accessibility Workgroup:	http://a11y.org

The World Wide Web Consortium (W3C), Web Accessibility Initiative (WAI)
Chair,	Protocols & Formats	http://www.w3.org/wai/pf
	Indie UI			http://www.w3.org/WAI/IndieUI/
Received on Thursday, 12 December 2013 16:54:59 UTC

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