[Ffmpeg-devel] [RFC] ZMBV encoder

[Michael Niedermayer]

Hi

On Tue, Dec 05, 2006 at 02:17:11PM +0200, Kostya wrote:
[...]
> > > +/** Block comparing function
> > > + * XXX should be optimized and moved to DSPContext
> > > + * TODO handle out of edge ME
> > > + */
> > > +int block_cmp(uint8_t *src, int stride, uint8_t *src2, int stride2, int bw, int bh)
> > > +{
> > > +    int sum = 0;
> > > +    int i, j;
> > > +    for(j = 0; j < bh; j++){
> > > +        for(i = 0; i < bw; i++)
> > > +            sum += src[i] ^ src2[i];
> > > +        src += stride;
> > > +        src2 += stride2;
> > > +    }
> > > +    return sum;
> > > +}
> > 
> > i dont think sum += src[i] ^ src2[i]; is optimal compression wise ...
> > _maybe_
> 
> Maybe, but on some files it compresses ~1% better than
>  sum+=FFABS(src[i]-src2[i]);

i guess these are files with the palette in randomized order

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

If you really think that XML is the answer, then you definitly missunderstood
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