Video accessibility - Revision history

GPHemsley: added Category:Accessibility using HotCat

2013-07-09T14:30:28Z

added Category:Accessibility using HotCat

← Older revision		Revision as of 14:30, 9 July 2013
Line 178:		Line 178:

	Due to bandwidth concerns, Web content providers will probably opt to provide separate video files for dubbed languages.		Due to bandwidth concerns, Web content providers will probably opt to provide separate video files for dubbed languages.

			[[Category:Accessibility]]

Annevk: Reverted edits by JPS (talk) to last revision by Pilgrim

2010-05-09T07:01:51Z

Reverted edits by JPS (talk) to last revision by Pilgrim

← Older revision		Revision as of 07:01, 9 May 2010
Line 106:		Line 106:

	==Proposed Solutions==		==Proposed Solutions==

	* http://www.whatwg.org/specs/web-apps/current-work/multipage/commands.html#devices
	* http://www.whatwg.org/specs/web-apps/current-work/complete.html#devices (note: not in Last Call)
	* http://lists.whatwg.org/htdig.cgi/help-whatwg.org/2009-September/000333.html
	* http://lists.w3.org/Archives/Public/public-device-apis/
	* http://dev.w3.org/html5/html-device/
	* http://www.w3.org/2009/dap/
	* http://dev.w3.org/2009/dap/camera/
	* http://www.w3.org/TR/device-upload

	(to be completed)		(to be completed)

JPS: /* Proposed Solutions */ +8 links

2010-05-08T19:25:56Z

Proposed Solutions: +8 links

← Older revision		Revision as of 19:25, 8 May 2010
Line 106:		Line 106:

	==Proposed Solutions==		==Proposed Solutions==

			* http://www.whatwg.org/specs/web-apps/current-work/multipage/commands.html#devices
			* http://www.whatwg.org/specs/web-apps/current-work/complete.html#devices (note: not in Last Call)
			* http://lists.whatwg.org/htdig.cgi/help-whatwg.org/2009-September/000333.html
			* http://lists.w3.org/Archives/Public/public-device-apis/
			* http://dev.w3.org/html5/html-device/
			* http://www.w3.org/2009/dap/
			* http://dev.w3.org/2009/dap/camera/
			* http://www.w3.org/TR/device-upload

	(to be completed)		(to be completed)

Pilgrim: /* Closed Audio Description */

2008-10-20T18:10:01Z

Closed Audio Description

← Older revision		Revision as of 18:10, 20 October 2008
Line 144:		Line 144:

	In terms of player app decisions, this track shouldn't be presented by default but it should play if the user has opted in (perhaps via a permanent setting) to playing audio descriptions. Also, if the player app knows that a screen reader is in use, it might make sense to use that as a cue of turning on audio descriptions.		In terms of player app decisions, this track shouldn't be presented by default but it should play if the user has opted in (perhaps via a permanent setting) to playing audio descriptions. Also, if the player app knows that a screen reader is in use, it might make sense to use that as a cue of turning on audio descriptions.

			The state of the art for authoring audio descriptions is [http://ncam.wgbh.org/webaccess/magpie/magpie_help/audiodescription.html MAGpie], which exports a SMIL file that can be imported into QuickTime or RealPlayer for integration into the original video file.

	====Video Format Support====		====Video Format Support====

SilviaPfeiffer: added muxing description on server

2008-09-28T05:41:57Z

added muxing description on server

← Older revision		Revision as of 05:41, 28 September 2008
Line 158:		Line 158:

	Should the above-mentioned tracks be muxed into the main video file (Pro: all tracks travel together; Con: off-by-default tracks take bandwidth)? Or should they be separate HTTP resources (Pro: bandwidth optimization; Con: Web-specific content assembly from many files may not survive downloading to disk, etc.) Also note that separate files makes it easier for a 3rd party to add tracks -- but these tracks may be commentary rather than captions, so this is both a pro and a con.		Should the above-mentioned tracks be muxed into the main video file (Pro: all tracks travel together; Con: off-by-default tracks take bandwidth)? Or should they be separate HTTP resources (Pro: bandwidth optimization; Con: Web-specific content assembly from many files may not survive downloading to disk, etc.) Also note that separate files makes it easier for a 3rd party to add tracks -- but these tracks may be commentary rather than captions, so this is both a pro and a con.

			An alternative is to have the separate resources on the server (or even: on diverse servers) and the server offers to the user agent the selection of tracks available for the video. When the user agent replies with what it requires (based on a user's preference settings), the server dynamically creates the video/audio with all required tracks and delivers it as one muxed file with a header that explains what is contained. If required, the separate HTTP resources are still accessible separately.

	===Related Non-Accessibility Features===		===Related Non-Accessibility Features===

SilviaPfeiffer: /* Authoring Requirements */

2008-09-28T03:55:46Z

Authoring Requirements

← Older revision		Revision as of 03:55, 28 September 2008
Line 91:		Line 91:
	** Ability to use native browser controls for selecting captions/subtitles		** Ability to use native browser controls for selecting captions/subtitles
	* Audio Descriptions:		* Audio Descriptions:
	** Ability to provide contols to toggle audio descriptions on/off during playback.		** Ability to provide custom contols to toggle audio descriptions on/off during playback.

	===End User Requirements===		===End User Requirements===

SilviaPfeiffer: added authoring requirement for audio descriptions

2008-09-28T03:54:24Z

added authoring requirement for audio descriptions

← Older revision		Revision as of 03:54, 28 September 2008
Line 91:		Line 91:
	** Ability to use native browser controls for selecting captions/subtitles		** Ability to use native browser controls for selecting captions/subtitles
	* Audio Descriptions:		* Audio Descriptions:
	** ~~(None yet)~~		** Ability to provide contols to toggle audio descriptions on/off during playback.

	===End User Requirements===		===End User Requirements===

Lachlan Hunt: /* Video Format Support */ Added MKV

2008-09-12T11:09:46Z

Video Format Support: Added MKV

← Older revision		Revision as of 11:09, 12 September 2008
Line 132:		Line 132:

	3GPP Timed Text aka. MPEG-4 part 17 is the timed text format for MP4. (How to mark as ''closed'' captions?)		3GPP Timed Text aka. MPEG-4 part 17 is the timed text format for MP4. (How to mark as ''closed'' captions?)

			=====Matroska=====

			Matroska (MKV) can support almost any subtitle format, and allows for a language tag and a human readable description to be associated with it.

	===Closed Audio Description===		===Closed Audio Description===

Lachlan Hunt: /* Author embedding third-party media, but attempting to keep the web page accessible */

2008-09-12T10:50:02Z

Author embedding third-party media, but attempting to keep the web page accessible

← Older revision		Revision as of 10:50, 12 September 2008
Line 15:		Line 15:
	===Author embedding third-party media, but attempting to keep the web page accessible===		===Author embedding third-party media, but attempting to keep the web page accessible===

	~~From~~ the ~~perspective~~ of the ~~end user, this could be any of the other use cases~~. ~~The reason to call this case out separately is that there needs to be a way for a web page~~ author to provide ~~accessibility and/~~or ~~fallback information even when~~ the ~~referenced media itself cannot be modified~~.		An author is embedding a third-party video into his website. The video does not contain captions or audio descriptions, and the author has no means of modifying the resource itself. But the author wants to provide some form of alternative or auxiliary content for people who cannot see or hear the video.

	===A commercial TV network publishes news reports on their website===		===A commercial TV network publishes news reports on their website===

Lachlan Hunt: /* A video hosting service allows authors to add captions and subtitles to their videos */

2008-09-11T23:11:05Z

A video hosting service allows authors to add captions and subtitles to their videos

← Older revision		Revision as of 23:11, 11 September 2008
Line 29:		Line 29:
	The service allows videos to be embedded within 3rd party websites and cannot rely on the publishers of those sites providing customised controls, although they can if they wish. The videos need to have native controls provided by the browser, which allow the user to select the appropriate captions or subtitles for their needs.		The service allows videos to be embedded within 3rd party websites and cannot rely on the publishers of those sites providing customised controls, although they can if they wish. The videos need to have native controls provided by the browser, which allow the user to select the appropriate captions or subtitles for their needs.

	* [http://www.youtube.com/blog?entry=mi8D3ntPgFQ "New Captions Feature For Videos"] on the YouTube blog		* [http://www.youtube.com/blog?entry=mi8D3ntPgFQ New Captions Feature For Videos] on the YouTube blog

	==End User Use Cases (Accessibility)==		==End User Use Cases (Accessibility)==