Accessibility/TimedText: Difference between revisions
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[http://www.w3.org/TR/2006/CR-ttaf1-dfxp-20061116/ W3C TimedText] | == Resources relating to [http://www.w3.org/TR/2006/CR-ttaf1-dfxp-20061116/ W3C TimedText] == | ||
* [http://www.w3.org/TR/2003/WD-tt-af-1-0-req-20030915/ comprehensive requirements] | * [http://www.w3.org/TR/2003/WD-tt-af-1-0-req-20030915/ comprehensive requirements] | ||
* [http://www.w3.org/TR/2006/CR-ttaf1-dfxp-20061116/#requirements DFXP satisfied requirements] | * [http://www.w3.org/TR/2006/CR-ttaf1-dfxp-20061116/#requirements DFXP satisfied requirements] | ||
* [http://www.3gpp.org/ftp/Specs/archive/26_series/26.245/26245-700.zip 3GPP Timed Text] | |||
* [http://www.w3.org/2006/DFXP/testsuite/Overview.html Test Cases] | |||
* [http://www.w3.org/2005/03/21/DFXPLastCallResponses.html#Issue11 Discussion of open issues on DFXP] | |||
== Interesting Features == | |||
=== DFXP === | |||
* head - body - separated document | |||
* div, p and span elements to structure content; they all have begin, end and duration attributes; | |||
* a "region" element defines the area into which the text is to be rendered; multiple regions can be displayed at the same time and they can spatially overlap | |||
* a "style" element defines a style for a region | |||
* the region is then referred to from an div, p, or span element to define where and how to render the text | |||
* a "layout" element groups metadata and regions | |||
* had dynamic text display through dynamic flow style | |||
* SMIL 2.1 based "set" element to control the animation of some other element | |||
* SMIL 2.1 based "timeContainer" specification to specify local sequential or parallel child elements | |||
* metadata specification possible in Dublin Core style | |||
Example document: http://www.w3.org/TR/2006/CR-ttaf1-dfxp-20061116/#region-mapping-example-1-s | |||
=== 3GPP TimedText === | |||
This specification defines the subpart of the DFXP authoring language that is supported on 3GPP and how it maps into the 3GPP file format. | |||
* each timed text track defines a region with width, height, translation | |||
* within the region is defined a text box set into which captions are rendered | |||
* styling is applied to the region and/or the text box(es) | |||
* there is a "layer" value that decides between timed text tracks and video tracks the order of display layers | |||
* i18n is achieved with language spec, writing direction, and character set support | |||
* marquee-scrolling (ticker scrolling) is defined through scroll-in, scroll-out, scroll-delay attributes, scroll speed depends on the duration of this text segment | |||
* dynamic highlighting as in Karaoke or Closed Captions is mentioned | |||
* soft text wrap from line to line is supported to fit text within a text box | |||
* outgoing hyperlinks are supported by attributing them to text boxes | |||
* media mapping is defined for MPEG-4 | |||
Latest revision as of 10:10, 7 April 2010
Resources relating to W3C TimedText
Interesting Features
DFXP
- head - body - separated document
- div, p and span elements to structure content; they all have begin, end and duration attributes;
- a "region" element defines the area into which the text is to be rendered; multiple regions can be displayed at the same time and they can spatially overlap
- a "style" element defines a style for a region
- the region is then referred to from an div, p, or span element to define where and how to render the text
- a "layout" element groups metadata and regions
- had dynamic text display through dynamic flow style
- SMIL 2.1 based "set" element to control the animation of some other element
- SMIL 2.1 based "timeContainer" specification to specify local sequential or parallel child elements
- metadata specification possible in Dublin Core style
Example document: http://www.w3.org/TR/2006/CR-ttaf1-dfxp-20061116/#region-mapping-example-1-s
3GPP TimedText
This specification defines the subpart of the DFXP authoring language that is supported on 3GPP and how it maps into the 3GPP file format.
- each timed text track defines a region with width, height, translation
- within the region is defined a text box set into which captions are rendered
- styling is applied to the region and/or the text box(es)
- there is a "layer" value that decides between timed text tracks and video tracks the order of display layers
- i18n is achieved with language spec, writing direction, and character set support
- marquee-scrolling (ticker scrolling) is defined through scroll-in, scroll-out, scroll-delay attributes, scroll speed depends on the duration of this text segment
- dynamic highlighting as in Karaoke or Closed Captions is mentioned
- soft text wrap from line to line is supported to fit text within a text box
- outgoing hyperlinks are supported by attributing them to text boxes
- media mapping is defined for MPEG-4