Re[2]: [XviD-devel] API 3.0

[Radoslaw Czyz]

Hi

> I don't know if anyone uses it - I guess not because not many people use
> mv-hints at all. IIRC Koepi mentioned sometimes that mv-hints give
> significantly lower quality in 2pass encodes and that he therefore does not
> recommend mv hints. SysKin mentioned an idea how to use mv hinting to
> increase quality of two-pass encodes (by using mrSAD in second pass iirc),
> so maybe we should completely redesign the mv hinting system...

Whatever you do, make hinted me still available. My hinted motion
estimation is fully working, even if it's reasonably simple and doesn't
increase quality yet. It's simply very fast.
I really believe that first pass is not _that_ different then the
second to throw away all the information. I think I could think of
extending hinted mv data - for example, if inter/intra decision was
'on the edge' we could remeber it and re-calculate the decision in
second pass - but if it wasn't even close, we don't have to.

BTW, do you know a way to compute PSNR of my second pass? I'd like to
compare hinted me search vs. full me search, but I have no idea how ;)
A simple program to compute PSNR between 2 avi's would be the best,
and I have a strange feeling that I've read about it somewhere - on a
forum of sort - but search at Doom9's didn't give me any effect.

Thanks,
Radek