[FFmpeg-devel] [PATCH] FFV1 2pass

Loren Merritt lorenm
Sun Oct 24 11:52:37 CEST 2010

On Sat, 23 Oct 2010, Michael Niedermayer wrote:

> The patches below add a 2pass mode to ffv1 that optimally sorts the range
> coder states. The compression gain is for my test quite small but more things
> can be added in the future to be finetuned in 2 passes ...
> Also ive not been able to meassure speedloss here for the added code.

Why is the default ever nonmonotonic? I could understand optimizing the 
transition table in ways that don't preserve isomorphism (e.g. adjust 
learning rate), but not just a reorder.

--Loren Merritt

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