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For other uses, see Sami (disambiguation). Synchronized Accessible Media Interchange Filename extension .smi, .sami Developed by Microsoft Type of format Markup Language SAMI (Synchronized Accessible Media Interchange) is a Microsoft accessibility initiative released in 1998. The structured markup language is designed to simplify creating captions for media playback on a PC, i.e. not for broadcast purposes. SAMI documents are text, and can be written in any text editor, although there are special utilities available to create SAMI documents. They use .smi or .sami file extensions. The common use of .smi for SAMI files creates a file extension collision with SMIL files. Each SAMI document may contain more than one language. Contents 1 Provides Closed Caption Information 2 How SAMI Works 2.1 Basic Example 2.2 How SAMI links to a Multimedia File 3 Use of HTML Tags and CSS 4 Media Players that Support SAMI 5 SAMI Authoring Tools 6 See also 7 External links // Provides Closed Caption Information A SAMI file provides closed caption support for a variety of multimedia formats. Generally, a multimedia file (such as a video or a sound file) can be played using a utility such as Windows Media Player. Closed captions can be provided for that media via a separate SAMI file. How SAMI Works The multimedia file and the SAMI file are synchronized by timing information that is included in the SAMI file. The format is simple. The SAMI file basically tells the player to display a certain closed caption at a particular time. Basic Example Here's an example SAMI file. It sets the time to milliseconds. It uses CSS for formatting for both the source and text lines and it supports language selection (English and faux-French shown). Each SYNC block sets the start time for the caption (start=). A new caption is displayed every second (1000ms). The Class= identifies the language. The ID=Source (matching the #Source in the CSS identifier definition) indicates the source/speaker line; the default is the closed caption. The identifier name need not be "Source"; it may be any name. The Microsoft parser is fragile. Formatting information can be added to the closed caption information, but adding format information to the source line can have unpredictable results. Defining more than one ID can have unpredictable results. <SAMI> <HEAD> <TITLE>SAMI Example</TITLE> <SAMIParam> Media {cheap44.wav} Metrics {time:ms;} Spec {MSFT:1.0;} </SAMIParam> <STYLE TYPE="text/css"> <!-- P { font-family: Arial; font-weight: normal; color: white; background-color: black; text-align: center; } #Source {color: red; background-color: blue; font-family: Courier; font-size: 12pt; font-weight: normal; text-align: left; } .ENUSCC { name: English; lang: en-US ; SAMIType: CC ; } .FRFRCC { name: French; lang: fr-FR ; SAMIType: CC ; } --> </STYLE> </HEAD> <BODY> <-- Open play menu, choose Captions and Subtiles, On if available --> <-- Open tools menu, Security, Show local captions when present --> <SYNC Start=0> <P Class=ENUSCC ID=Source>The Speaker</P> <P Class=ENUSCC>SAMI 0000 text</P> <P Class=FRFRCC ID=Source>French The Speaker</P> <P Class=FRFRCC>French SAMI 0000 text</P> </SYNC> <SYNC Start=1000> <P Class=ENUSCC>SAMI 1000 text</P> <P Class=FRFRCC>French SAMI 1000 text</P> </SYNC> <SYNC Start=2000> <P Class=ENUSCC>SAMI 2000 text</P> <P Class=FRFRCC>French SAMI 2000 text</P> </SYNC> <SYNC Start=3000> <P Class=ENUSCC>SAMI 3000 text</P> <P Class=FRFRCC>French SAMI 3000 text</P> </SYNC> </BODY> </SAMI> How SAMI links to a Multimedia File The player needs to know how to link a particular media file to a SAMI file. Sometimes that is achieved by using the same filename as the underlying media file but using a .SMI file extension. For example, when Windows Media Player ("WMP") opens the sound file cheap44.wav, it checks to see if the file cheap44.smi exists in the same directory. If it does, WMP uses that file to display closed captions. Alternatively, the linkage can be made explicit using an entry in an ASX file and opening the ASX file. <asx version="3.0" previewmode="No" > <abstract>ASXHEAD This is the shows abstract</abstract> <title>ASXHEAD The show title goes here</title> <author>Author Name</author> <copyright>(c) 2002 - company name</copyright> <entry> <ref href="cheap44.wav?sami=cheap44.smi" /> <abstract>ASX This is the clips abstract</abstract> <title>ASX The title for the clip goes here</title> <author>ASX Your Name</author> <copyright>ASX (c) 2000 - company name</copyright> </entry> </asx> Use of HTML Tags and CSS SAMI format is similar to and borrowed from HTML and CSS, but SAMI only implements a subset of both. SAMI does not require strict tag matching. The Microsoft SAMI parser used in Windows XP is a limited parser. Although CSS is supported, the parser may be confused by comment lines. Although several examples on the web show the use of several CSS ID tags, the MS SAMI parser only uses two ID tags -- and perhaps only one named ID and one default ID. The ID tags are used to distinguish the source (speaker) line from the ordinary CC text. Using explicit format tags in the speaker line confuses the parser. Some automated tools may avoid the problem by using explicit text formatting rather than relying on CSS. The following HTML tags are valid in SAMI: Name Description B Bold text style BASEFONT Base font size BDO I18N BiDi override BIG Large text style BLOCKQUOTE Long quotation BR Forced line break CAPTION Table caption CENTER Shorthand for DIV align=center COL Table column COLGROUP Table column group DD Definition description DIV Generic language/style container DL Definition list DT Definition term FONT Local change to font H1 Heading H2 Heading H3 Heading H4 Heading H5 Heading H6 Heading HR Horizontal rule I Italic text style IMG Embedded image LI List item OL Ordered list P Paragraph PRE Preformatted text Q Short inline quotation S Strike-through text style SMALL Small text style SPAN Generic language/style container STRIKE Strike-through text SUB Subscript SUP Superscript TABLE N/A TBODY Table body TD Table data cell TFOOT Table footer TH Table header cell THEAD Table header TR Table row TT Teletype or monospaced text style U Underlined text style UL Unordered list Media Players that Support SAMI Chameleo K-Multimedia Player MPlayer Perian VLC Media Player Windows Media Player Xine XBMC GOM Player SAMI Authoring Tools Audio WASP[dead link] Hi-Caption MAGpie WinCAPS by SysMedia MacCaption and CaptionMaker by CPC See also SMIL Closed captioning Subtitle (captioning) External links Understanding SAMI 1.0, Microsoft Technical Article, February 2003. SAMI and Quicktime Captioning, Jon Gunderson. Captioning for Windows Media, WebAIM, Utah State University.