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Accessibility/TimedText: Difference between revisions
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3GPP details
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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] | |||
== Interesting Features == | |||
=== DFXP === | |||
=== 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 | |||
* media mapping is defined for MPEG-4 | |||