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Techniques for Creating Accessible, Closed Captioned Web-Based Video California State University - Northridge 21st Annual International Technology and Persons with Disabilities Conference Los Angeles, California March 22, 2007 http://disability.law.uiowa.edu/lhpdc/publications/kleinpubs.html David Klein K. “Fritz” Thompson
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Flash Video is played back by Flash Player Version 7 of the Flash Player in the browser required for the end user Interface (controls, layout) located in.swf file
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Flash Video Frustrated with “player wars” Lack of standards compliance Continual, relentless upgrades Difficulty in upgrading – pushing users toward paid versions Hijacking of media types / file extensions
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Flash Rationale Becoming more accessible by version 6 Full integration with video by version 7 Greater installed base Handles video well Fast Developer-level flexibility Can revise interface as needed Control over accessibility (within Flash capabilities)
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Flash Files Video .flv Caption file We use the QuickTime caption file XML configuration file Integrates video and caption files Flash player (Shockwave) .swf compiled from Flash code HTML Flash code file (.fla) Optional for further development
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Flash Video Player Assembly The Flash playback engine – videoname.swf The video – videoname.flv The caption file – videoname.en_US.qt.txt Same caption file as used for QT (or SAMI file is possible) The caption control file – captions.xml Includes URLs to video and captions files User can toggle captions in the video player with CC icon (on by default)
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Captions.xml File Characteristics Use XML standards Tags case sensitive All elements closed xxx (open and close tags) (no explicit close tag; use the slash)
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XML Configuration <flashcaptioning><ccconfig><CaptionLocation>captionfile.txt</CaptionLocation><VideoLocation>video.flv</VideoLocation><VideoSizeWidth>240</VideoSizeWidth><VideoSizeHeight>180</VideoSizeHeight> <VideoTotalTime>1948.03</VideoTotalTime> <XMLFileUsed></XMLFileUsed></ccconfig></flashcaptioning>
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Flash Video Player Activity Handout: Flash captions.xml Activity - Assemble Files Objective: Modify an XML file and assemble the QuickTime captions file with the Flash video player to create a captioned, Flash video.
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Flash Video Player Files Place all files together in a folder Video (.flv) Caption file (video_caption.txt) XML file (caption.xml) Flash video player file (.swf)
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Flash Security Keep files in same folder when possible Use BASE attribute in HTML </object And And Test thoroughly, especially among browsers and browser versions More: http://www.macromedia.com/devnet/flash/whitepapers/security.pdf http://www.macromedia.com/devnet/flash/whitepapers/security.pdf http://www.macromedia.com/devnet/flash/articles/fplayer_security.html http://www.macromedia.com/devnet/flash/articles/fplayer_security.html
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NCAM’s CC For Flash Display New Captions Can import and display a new caption file at any time Dynamic Styles Recognizes certain style changes in DFXP files Language List Provides a list of languages found in DFXP files Change Caption Language Can change to another caption language while video is playing Search Can search for a string of text in the caption file and return the time of the next instance where the text occurs in a caption (available for external caption files only)
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ccPlayer (Flash video player) Flash video player for those who don’t want to author their own Uses the CC for Flash component to display captions Can be embedded in any HTML page Plays captions from external DFXP and QTtext files or embedded captions Minimal programming experience necessary
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