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Caption File Formats

Each player has its own file specifications – some are proprietary while others use general file standards. Here is a table of the most common formats and their players:

Acronym	Stands for	Players	Notes
TTML (Timed Text Markup Language)	Distribution Format Exchange Profile	Flash, YouTube	Also known as DFXP (“Distribution Format Exchange Profile”). An XML markup language and draft standard defined by W3C.
SMIL	Synchronized Multimedia Integration Language	Quicktime, RealPlayer	Also an XML markup language that is a W3C standard
SAMI	Synchronized Accessible Media Interchange	Windows Media Player, YouTube	Microsoft's format
SRT	SubRip	YouTube	A YouTube-supported and documented format
SUB	SubViewer	YouTube	A YouTube-supported and documented format