Introduction to Captioning for Windows Media
Windows Media Player adds captions using Microsoft's Synchronized Accessible Media Interchange (SAMI). SAMI, like SMIL, which is used by Quicktime and RealPlayer, is an XML-based text language. A SAMI file contains the captions and definitions for how and when the captions should display. Unlike SMIL, which points to an external captions file (.rt for RealPlayer and .mov or .txt for Quicktime), SAMI files contain the captions themselves. Windows Media Player uses an ASX (or sometimes WVX or WAX) to combine the SAMI captions with the media file. The captions can also be automatically added to a media file when they are both embedded within a web page.
For captions to display in the stand-alone Windows Media Player, they must usually be turned on manually. This can be done by selectingor in older versions of Windows Media Player. In Windows Media Player 9 or newer, select (or ). In Windows Media Player 10, you may have to enable to view local caption files.