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It was initially designed to provide subtitles for Ogg Theora videos, but is also useful for song lyrics with Ogg Vorbis, transcripts with Ogg Speex, or any other place where it's useful to combine text with audio or video.
Unlike most subtitle formats which are in separate files from the audio/video content, Ogg Writ is muxed with audio/video streams so that it can be delivered as one file.
Its design makes it easy to extend with new features. It currently supports multiple languages and specific placement of the text in one or more windows.