Synchronized Accessible Media Interchange (SAMI) is a Microsoft accessibility initiative released in 1998. The structured markup language is designed to simplify creating subtitles for media playback on a PC.
A SAMI file provides closed caption support for multimedia formats. Generally, a multimedia file (such as a video or a sound file) is played by a media player such as Windows Media Player. Media players that support closed captioning and SAMI format may display the contents of the included SAMI file.
A SAMI file is a plain text file and therefore can be created or modified in any text editor. Its structure is very similar to HTML. The files may have either .smi or .sami filename extensions, although using .smi may cause a filename extension collision since Synchronized Multimedia Integration Language (SMIL) files and Macintosh self mounting images also use this filename extension.