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Accessibility/Video a11y requirements

515 bytes added, 07:42, 8 November 2008
added layout information
* [http://en.wikipedia.org/wiki/Closed_captioning closed captions] are caption text that can be activated/deactivated to be displayed on top of the video
* while there is a [http://en.wikipedia.org/wiki/Closed_captioning#Television_and_video multitude of methods to encode closed captions into TV signals], we will here refer to closed captions only as a textual representation of captions relating to a digital video file
 
Layout:
* textual captions are rendered over either the top or the bottom of the video screen
* they are not more than 1-2 lines of text normally
* textual captions do not overlap in time, but are normally sequential
* sometimes captions are split between the left and the right half of the screen to associate better who is speaking what
* sometimes captions are coloured differently for different people
* sometimes a negative colour is used to the default because the background colours of the video conflict
 
 
Discussion:
* (+) textual captions can be accessed as a textual representation of the video and used for purposes that go beyond the on-screen display, e.g. for display as braille or search purposes
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