[XviD-devel] motion estimation for B/P/I decision

[Christoph Lampert]

On Thu, 19 Sep 2002, Radoslaw 'sysKin' Czyz wrote:

> Hi again,
> 
> > I made a simple ME-similar routine for P/B/I-frame decision.

Hi Radek,

I integrated your ME code (the version with block based chroma
interpolation) into curent dev-api-3 tree, and I'm in the final stage of
testing, the code will make it into CVS afterwards. Of course, this will
be announced here at the list. 

Could you create a patch for VOP-decision _afterwards_ so everybody can
test by grabbing CVS and patching?

gruel


> 
> I definitely have good news for anime coders :) Encoder seems to put
> a P-frame every time an anime scene is changed considerably (as it
> happens in movement) but keeps virtually any number of B frames if
> scene only pans or stays static.
> As a result, all of my encodings at fixed quant are 70..75% smaller,
> while I bet noone could ever say that B-frame encoding looks worse. In
> fact, I'd say that b-frame clip looks better because B frames seem to
> fight the "static noise on smooth moving wall" artifact.
> 
> I used max_bframes = 8 and b-quant ratio of 200%. It looks good with
> 250% too, because there is no danger that B frame will appear at a big
> scene change (it will be coded as at least P frame then).
> 
> What do you think?
> 
> Radek
> 
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