[XviD-devel] hq ac prediction mode
Christoph Lampert
chl at math.uni-bonn.de
Sun Feb 9 20:25:51 CET 2003
On Sun, 9 Feb 2003, Edouard Gomez wrote:
> Very basic test with "Le fabuleux destin d'Amelie Poulain"
>
> First 10000 frames sequence (frames resized to 640x272)
>
> Quantizer | Size | Options
> ----------+----------+---------------------------------------------------------------
> q3 81223900 base options
> q3 80142222 base options + PMV_CHROMA16 + PMV_CHROMA8
> q3 81110018 base options + HQ acdc prediction
> q3 79989286 base options + PMV_CHROMA16 + PMV_CHROMA8 + HQ acdc prediction
>
> It saves 0.15% for non chromaME and 0.19% for chromaME while
> just using chromaME can save 1.3%
Oh well, better than nothing, isn't it? 0.19% on a full CD is 1.4 MB,
sometimes that's just what's missing to fit on a CD-R ;-)
gruel
P.S. Btw. Chroma_ME. Does anyone know _why_ chroma ME has such a positive
effect? Is it really the chromanance bits, or is it rather that search
doesn't terminate as early? Or is the result closer to "real motion" , so
motion field get smoother?
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