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Dirac is an advanced royalty-free video compression format designed for a wide range of uses, from delivering low-resolution web content to broadcasting HD and beyond, to near-lossless studio editing.

More information is available on the Dirac homepage.

See http://diracvideo.org/download/mapping-specs/dirac-mapping-ogg-1.0.pdf for the official Ogg Dirac mapping.

The Ogg Dirac mapping does NOT use VorbisComment metadata.