[XviD-devel] qpel - problems I found

Marc FD xvid-devel@xvid.org
Sat, 12 Oct 2002 17:27:00 +0200


Hi ^^

I just tested last CVS (15 minutes ago, after SysKin last changes)

i've some questions :
- PMV_QUICKSTOP16 is not implemented, right ? so in vfw, motion effort 0 to
3 == 0 ?
- PMV_HALFPELDIAMOND16 is not needed if there is already PMV_HALFPELREFINE16
?
- I should use XVID_QUARTERPEL | XVID_HALFPEL in general and
PMV_HALFPELREFINE16 | PMV_QUARTERPELREFINE16 | PMV_HALFPELREFINE8 |
PMV_QUARTERPELREFINE8 in motion to enable qpel ?
- Why qpel encodes have about 2x less Iframes ? a bug ?
- The crispness (noise?) i see with qpel, is it normal ?

i noticed that qpel makes files larger and lowers the PSNR, but i assume
it's
because it's not finished.

BTW, ffdshow (10-10-02) decoding looks good, only bug with chroma.
and decoding with DivX 5.02 looks horrible (seems to be only with inter4v
vectors)

Cheers,
MarcFD