[Ffmpeg-devel] VC-1 quarterpel interpolation

[Kostya]

On Mon, Apr 23, 2007 at 12:04:58AM -0700, John Kelley wrote:
> Any updates on this? In general there are still a lot of artifacts in
> ffmpeg's VC-1 decoding.
 
It seems no difference to me and I'm pretty sure that artifacts are
caused by anything else. Please provide a sample, patches are welcome too.

> On 3/8/07, Kostya <kostya.shishkov at gmail.com> wrote:
> >On Thu, Mar 08, 2007 at 06:00:51PM +0100, Eds?, Tomas wrote:
> >> Hi all!
> >>
> >> I noticed that ffmpeg interpolates VC-1 bicubic quarterpels horizontal 
> >direction first, then vertical. The reference decoder does this vertical 
> >first, then horizontal. This is also what the specification tells you to 
> >do. Since rounding is performed after vertical filtering, this should lead 
> >to different results.
> >>
> >> This seems lika a possible bug. Has anyone already fixed this or am I 
> >wrong in any way?
> >
> >I'll see tomorrow if changing order gives any change on decoding.
> >
> >> Best regards
> >> /Tomas Eds?
> >> tomas.edso at anoto.com
> >>