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#HTML5 VIDEO PLAYER CLOSED CAPTIONING WINDOWS#

#HTML5 VIDEO PLAYER CLOSED CAPTIONING WINDOWS#

This can be done either using the HTML element to embed a media player, as described in the MSDN document Understanding SAMI 1.0 or using an ASX file, as described in the WebAIM tutorial Captioning For Windows Media. To play closed captions in WMP, the video file and caption file must both be passed to the player. SAMI is the format supported by Windows Media Player (WMP). Unlike SMIL, which references captions that are stored in a separate file, SAMI files include the captions. SAMI, short for "Synchronized Accessible Media Interchange", is Microsoft's format for delivering closed captions.The two formats are described in Apple's Text Descriptors Tutorial and Real's Text Tags Guide, respectively. The format of the caption text file is different in Quicktime than it is in Real Player. To display captions in either of these products, the player must open the SMIL file, which then references the other media files (i.e, the video and caption text file). SMIL is supported by both Quicktime and Real players for delivering closed captions.

SMIL, short for "Synchronized Multimedia Integration Language", is also a W3C standard, and an XML markup language, designed to allow for the synchronized presentation of various media components such as video, text, images, and audio.

For additional information consult the Timed Text 1.0 DFXP specification. It is the most common format used by Flash video players that support closed captions. It is an XML markup language specifically designed for marking up timed text, or captions.

Timed Text or DFXP, short for "Distribution Format Exchange Profile", is a World Wide Web Consortium (W3C) draft standard.

The following is a summary of some of the more common closed caption file types used to deliver captions for video on the Web: Closed captions come in a variety of different file types, and media players vary as to which file types they support. However, in some context there are advantages to closed captions as described in the Knowledge Base article What is the difference between open and closed captioning?. Open captions are displayed in all video players. Captions are either open (part of the video, therefore always visible) or closed (a separate text track, which can typically be turned on or off).

Captions are necessary for people who are deaf and hard of hearing to access the audio portion of video presentations.