Multimedia file stored in the Annodex exchange format, which enables indexing and annotation of contained video and audio; intended to be widely used on the web to make searching for video and audio content easier.

The Annodex format is built on the Ogg container format. It includes a skeleton track, which provides codec information that helps in the parsing and multiplexing process, and at least one Continuous Media Markup Language (CMML) bitstream. The format uses CMML, which is similar to XML, to provide metadata for different time sections of the multimedia file. This allows the file to be textually searched, much like a web page is searched by Google, even though it is a binary file. The format lets you perform search-related functions, such as directly accessing a clip inside a video on a web server, or fast forwarding to a particular moment within a piece of music. NOTE: The Annodex plugin for the Mozilla Firefox web browser is no longer available.