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Re: Survey ready on Media Text Associations proposal

From: Markku Hakkinen <mhakkinen@acm.org>
Date: Thu, 11 Mar 2010 16:11:16 -0500
Message-ID: <3dcaabaf1003111311y39b517c0m7d2b3339018429dc@mail.gmail.com>
To: Silvia Pfeiffer <silviapfeiffer1@gmail.com>
Cc: Eric Carlson <eric.carlson@apple.com>, Maciej Stachowiak <mjs@apple.com>, Philip Jägenstedt <philipj@opera.com>, Michael Smith <mike@w3.org>, HTML Accessibility Task Force <public-html-a11y@w3.org>
The User Agent Accessibility Guidelines (just released UAAG 2.0 Public
Working Draft [1]), has specific recommendations for time-based media
preferences and controls.

For example:

4.9.8 Track Enable/Disable of Time-Based Media. During time-based
media playback, the user can determine which tracks are available and
select or deselect tracks. These selections may override global
default settings for captions, audio descriptions, etc. (Level A)

There are a number guidelines which deal with audio/video/multi-track,
and one of my action items is to get some synchronization between the
HTML5 developments and UAAG.  I'll aim to pull together the relevant
UAAG guidelines in the next week and post to the list.


[1] http://www.w3.org/TR/UAAG20/
On Thu, Mar 11, 2010 at 3:54 PM, Silvia Pfeiffer
<silviapfeiffer1@gmail.com> wrote:
> On Fri, Mar 12, 2010 at 2:36 AM, Eric Carlson <eric.carlson@apple.com> wrote:
> >
> > On Mar 10, 2010, at 8:34 PM, Maciej Stachowiak wrote:
> >
> >>
> >> On Mar 10, 2010, at 8:25 PM, Philip Jägenstedt wrote:
> >>
> >>> On Thu, 11 Mar 2010 12:10:01 +0800, Silvia Pfeiffer <silviapfeiffer1@gmail.com> wrote:
> >>>
> >>>> On Thu, Mar 11, 2010 at 2:56 PM, Philip Jägenstedt <philipj@opera.com> wrote:
> >>>>> Is the intention that we specify a track selection algorithm with exact
> >>>>> rules for which track to enable based on settings, or should this be left to
> >>>>> UAs to override ad-hoc?
> >>>>
> >>>> I don't think anything is prescribed to UAs in the HTML spec - if at
> >>>> all we can only make recommendations on what override rules a UA uses.
> >>>> No?
> >>>
> >>> There are very clear rules for resource selection for <source> and no provision for the UA to override this. I'm asking if the intention is to specify with the same level of detail which <track> to select and not allow UAs to override this, or if we should simply say that the UA can do whatever it wants. I don't like the latter because it will certainly lead to poor interoperability.
> >>
> >> I would prefer if the rules for <track> are as precise as the ones for <source>, but I also think that this level of detail can wait until after the proposal is submitted to the HTML WG.
> >>
> >  I agree with Maciej and Philip, we should have precise rules for <track> selection.
> Does HTML on other things require user preference settings to be
> implemented in browsers?
> Cheers,
> Silvia.
Received on Thursday, 11 March 2010 21:11:51 UTC

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