On2 VP3

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VP3 is the third video codec produced by On2. In 2002, On2 released the source code as open source and it eventually evolved into the Theora project.

VP30 and VP31 are not bitstream-compatible codecs. While VP31 is open source VP30 is not decodable via the same process. Additionally VP32 was in the works but it was later released as On2 VP4 instead.

An opensource implementation for all those VP3 codec variations can be found in NihAV [1].