Concepts & Techniques for Accessible, Closed Captioned Web-Based Video 10th Annual Accessing Higher Ground: Accessible Media, Web and Technology Conference.

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Presentation transcript:

Concepts & Techniques for Accessible, Closed Captioned Web-Based Video 10th Annual Accessing Higher Ground: Accessible Media, Web and Technology Conference Boulder, Colorado November 7, David Klein K. “Fritz” Thompson

Flash  Video is played back by Flash Player  Version 7 or above of the Flash Player required for the end user  Interface (controls, layout) located in.swf file

Flash Video  De facto Web standard because of “player wars”  Lack of standards compliance  Continual, relentless upgrades  Difficulty in upgrading – pushing users toward paid versions  Hijacking of media types / file extensions  People just want video to work

Flash History  Becoming more accessible by version 6  Full integration with video by version 7  Ubiquitous (around 97% share)  YouTube, MySpace  Handles video well  Sorenson Spark codec  ON2VP6 codec  Fast  Developer-level flexibility  Can revise interface as needed  Control over accessibility (within Flash capabilities)

Captioned Flash Video  Flash Video Player (ours)  CC for Flash / ccPlayer (National Center for Accessible Media – WGBH)  FLVPlayback / FLVPlaybackCaptioning Components for Flash (Adobe)

Flash Video Player  Allows captioned video without Flash programming  Open source  Major or minor customization possible  Flash 7.0 and above

CC for Flash / ccPlayer  ccPlayer allows captioned video without Flash programming  Flash components  Skins  Little Flash knowledge needed  Closed source, so customization is limited  DFXP caption files  Flash 8.0

FLVPlaybackCaptions  Flash programming required  Minimal Flash knowledge needed  Skins  Closed source, so customization is limited  DFXP caption files  Flash 9.0 (CS3)

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

Flash Video Player Assembly Flash program file videoname.swf Video file videoname.flv Caption file videoname_captions.txt (Same file as used for QT) Caption control file captions.xml (Video and caption file locations) Flash code file videoname.fla (optional)

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)

XML Configuration <flashcaptioning><ccconfig> captionfile.txt captionfile.txt video.flv video.flv <XMLFileUsed></XMLFileUsed></ccconfig></flashcaptioning>

Flash Video Player Activity  Handout: Activity 3: Flash Video Player  Objective:  Modify an XML file and assemble the QuickTime captions file with the Flash video player to create a web-enabled, captioned, Flash video.

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)

Flash Security  Keep files in same folder when possible  Use BASE attribute in HTML  </object  Or  Or  Test thoroughly, especially among browsers and browser versions  More:  