[Ffmpeg-devel] libavcodec: possible QPEL decoding bug.

[Matthias Wieser]

Am Samstag, 10. September 2005 23:27 schrieb Morten Nilsen:
> Marius the Mad wrote:
> > What it looks like:
> >
> > frame 154 from my sample, decoded by:
> >
> > XviD: http://img39.imageshack.us/img39/3341/154xvid6xt.png
> > libavcodec: http://img39.imageshack.us/img39/4590/154avcodec2da.png
> >
> >
> > Frame 283:
> >
> > XviD: http://img39.imageshack.us/img39/6135/283xvid3tg.png
> > libavcodec: http://img39.imageshack.us/img39/573/283avcodec5xl.png
>
> I don't see any difference..

Try increasing the gamma value. If you use kuickshow as image viewer you 
could press "g" four times to lighten the images up. Then you will see 
that either libavcodec or xvid is faulty.

Regards,
  Matthias

btw. you can use gimp to show the difference between both images. The 
difference image won't be all black. Increase the gamma value to brighten 
the differences.