[theora] range coding experiments?

Sergey Kurdakov sergey.forum at gmail.com
Sat Sep 26 14:19:12 PDT 2009


demo pages

discussed opportunity to add range coding

there is already some xiph code:


and Timothy B. Terriberry

wrote some time ago

I'd estimate that you'd save ~12% by switching from Huffman to something
arithmetic coding-based for video (based on the experiments with
H.264... Theora has more flexible Huffman coding for some pieces, and
less flexible coding for others, so it probably averages out on the

now as tuning is finished, will anyone attempt to perform tests ( as
it follows from "based on the experiments with H.264" it should not be
such difficult to add changes ) how much theora encoder will gain from
range arithmetic coder on real clips ( using for example
http://media.xiph.org/ )?

Or how  difficult do you estimate to add range coder?


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