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Interesting, would like to see comparison with FFV1. Arithmetic coding beats Huffman all day every day, and pixel-aware predictors are a thing.

Arithmetic coding is very expensive - zstd uses new entropy coding with compression ratio like arithmetic coding, but with Huffman-like speed: https://github.com/Cyan4973/zstd https://github.com/Cyan4973/FiniteStateEntropy http://encode.ru/threads/2078-List-of-Asymmetric-Numeral-Sys...