Re[5]: [XviD-devel] qpel - problems I found

Michael Niedermayer xvid-devel@xvid.org
Sat, 12 Oct 2002 17:26:17 +0200


Hi

On Saturday 12 October 2002 17:19, Radek 'sysKin' Czyz wrote:
> > So it's ffdshow/libvacodec which forgets the rounding. Apart from
> > that, it seems to decode fine - no other artifacts.
>
> Hi,
> I just downloaded ffdshow sources and here it is, at the very
> beginning of mpeg_motion()
>
> if(s->quarter_sample)
> {
>     motion_x>>=1;
>     motion_y>>=1;
> }
> Which is wrong.
yes, if thats really in ffdshow than ffdshow is a bit behind ffmpeg, btw this 
was used for b frame-qpel only as there was no averaging qpel code written 
yet at that time ...

[...]

Michael