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I just thought I'd add this here since it's nice to have this kind of stuff documented: I already use kid3 to edit tags on mp4 video files, but many video hi-res files use the open mkv format instead. Many also use webm which is a subset of Matroshka (which has the same format as the pretty uncommon weba audio-only variant).

Some Links:

• Matroshka Tagging Spec
• WebM Tagging Spec (just a list of supported section types of the above)
• Matroshka Standard-Tagname Examples

(Note that Matroshka's tagging format is based on XML and freely extensible within reasonable limits; making it conceptually similar to Vorbis Comments. There is also a table comparison of their tag names to other tagging systems.)

Imported from SourceForge, author: ntninja