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Bug 11391 - Provide examples of actual <track> usage, user agent implications
Summary: Provide examples of actual <track> usage, user agent implications
Status: CLOSED FIXED
Alias: None
Product: HTML WG
Classification: Unclassified
Component: LC1 HTML5 spec (show other bugs)
Version: unspecified
Hardware: All All
: P2 normal
Target Milestone: ---
Assignee: John Foliot
QA Contact: HTML WG Bugzilla archive list
URL:
Whiteboard:
Keywords: a11y, a11ytf, media
Depends on: 11593
Blocks:
  Show dependency treegraph
 
Reported: 2010-11-23 16:37 UTC by Frank Olivier
Modified: 2012-01-13 20:29 UTC (History)
9 users (show)

See Also:


Attachments

Description Frank Olivier 2010-11-23 16:37:01 UTC
http://dev.w3.org/html5/spec/video.html#timed-track

The specification should specify different kinds of actual content files  (timed  or untimed track files) that may be associated with a media resource:
A textual representation of the content
An audio representation of the content (See SL-1, SL-2 in [1])
A video representation of the content
Non-synchronized alternatives that can be rendered as replacements for the original rendered content (DAC-5 in [1])

[1] http://www.w3.org/WAI/PF/HTML/wiki/Media_Accessibility_Checklist

SUGGEST:
http://dev.w3.org/html5/spec/video.html#dom-track-src

The src attribute points to an additional timed or untimed textual, audio or video representation of the media content that the user or user agent may display.

The rendering of the alternative / replacement content is defined by the actual track format and the user agent; for example:
Non-synchronized alternatives may be rendered as replacements for the original rendered content
A additional video representation of the original content may be rendered over the original content, or positioning in all parts of the screen. (CC-5 in [1])


[1] http://www.w3.org/WAI/PF/HTML/wiki/Media_Accessibility_Checklist
Comment 1 Frank Olivier 2010-11-24 02:27:45 UTC
Additionally, to satisfy...
(DV-8) Allow the author to provide fade and pan controls to be accurately synchronized with the original soundtrack.
(CN-2) The navigation track should provide for hierarchical structures with titles for the sections. 
...from http://www.w3.org/WAI/PF/HTML/wiki/Media_Accessibility_Checklist

Suggested spec text:
When a track is enabled (and depending on the type of track), the playback rate of a media element may be (temporarily) stopped, slowed down, or sped up to enable to user to understand the content. The user agent may also enable the user to navigate to time offsets in the original content.

Additionally, user agents should ensure that the presentation of the time-based original content and track content should always be in sync.
Comment 2 Martin Kliehm 2011-01-10 19:40:55 UTC
Adding dependency on bug 11593 as that one addresses alternative @kind attribute values.
Comment 3 Martin Kliehm 2011-01-11 17:09:50 UTC
The bug-triage sub-team thinks this bug should be TF priority. It has been discussed at TPAC and is part of the media accessibility topic.
Comment 4 Martin Kliehm 2011-01-11 18:07:34 UTC
Assigning to John Foliot to push the issue in the media sub-group.
Comment 5 Michael Cooper 2011-03-19 23:54:06 UTC
This is related to ISSUE-152 http://www.w3.org/html/wg/tracker/issues/152
Comment 6 Michael[tm] Smith 2011-08-04 05:17:04 UTC
mass-move component to LC1
Comment 7 Michael[tm] Smith 2011-11-20 15:09:43 UTC
See comment #4 from Martin:
> Assigning to John Foliot to push the issue in the media sub-group.

John, any progress on this yet?
Comment 8 Silvia Pfeiffer 2011-11-20 21:36:27 UTC
The media a11y TF has helped created spec text to resolve basically all of the accessibility needs in the checklist. The issues that Frank pointed out have been taken care of - some of them in the way that Frank proposed, others differently.

I think the onus is on Frank to state whether he still has any pending issues on this bug.
Comment 9 Michael[tm] Smith 2011-11-21 00:11:03 UTC
(In reply to comment #8)
> The media a11y TF has helped created spec text to resolve basically all of the
> accessibility needs in the checklist. The issues that Frank pointed out have
> been taken care of - some of them in the way that Frank proposed, others
> differently.
> 
> I think the onus is on Frank to state whether he still has any pending issues
> on this bug.

Frank is not Cc'ed on this bug. So if it's the case that we're waiting for a response from Frank, can somebody (John? Silvia?) please give Frank a heads-up that we are waiting for a response from him on this?
Comment 10 Michael[tm] Smith 2011-11-21 00:12:23 UTC
(In reply to comment #9)
> Frank is not Cc'ed on this bug. So if it's the case that we're waiting for a
> response from Frank, can somebody (John? Silvia?) please give Frank a heads-up
> that we are waiting for a response from him on this?

um, er, only after I posted that comment did I realize that Frank's not in the Cc list because he's the reporter for the bug...

So ignore my comment of course. Sorry for the noise.
Comment 11 Frank Olivier 2011-11-23 06:54:05 UTC
(In reply to comment #10)
> (In reply to comment #9)
> > Frank is not Cc'ed on this bug. So if it's the case that we're waiting for a
> > response from Frank, can somebody (John? Silvia?) please give Frank a heads-up
> > that we are waiting for a response from him on this?
> 
> um, er, only after I posted that comment did I realize that Frank's not in the
> Cc list because he's the reporter for the bug...
> 
> So ignore my comment of course. Sorry for the noise.

As John points out, we now have spec text that addressed the issues raised in this bug; we can resolve this bug as fixed.
Comment 12 Michael[tm] Smith 2011-11-23 06:57:26 UTC
(In reply to comment #11 from Frank)
> As John points out, we now have spec text that addressed the issues raised in
> this bug; we can resolve this bug as fixed.

Thanks -- moving this to resolved=fixed now