[FFmpeg-devel] [PATCH] Fix mlib DCT routine in dsputil

[Michael Niedermayer]

On Thu, Mar 27, 2008 at 10:33:20PM -0400, Albert Lee wrote:
> 
> On Thu, 2008-03-27 at 03:05 +0100, Michael Niedermayer wrote:
> > On Wed, Mar 26, 2008 at 04:32:44PM -0400, Albert Lee wrote:
> > > Hi,
> > > 
> > > 
> > > The ff_fdct_mlib() in dsputil has been broken for a long time; it
> > > assumes the mediaLib DCT scales its output by 8 (as libjpeg's does).
> > > This results in a well-known "green tint" problem. The attached patch
> > > adds the scaling.
> > > 
> > > I'm also attaching the email from the mediaLib engineer who proposed the
> > > fix.
> > 
> > Could you try to play the following file and tell us if it decodes without
> > artifacts on mlib?
> > 
> > http://samples.mplayerhq.hu/Divx4-bugs/Lorenna_McKennit-Mummers_Dance-Mononoke_Hime-gabucino.avi
> > 
> 
> Oh great, an AMV. Yeah, it looks fine. There was an awful lot of green in it to begin with, though.

green? You mean there are green blocks in there?
Does it look different when decoded with -idct 2 ?

If you cant see a difference iam very interrested in the output of tiny_psnr
from the 2 raw yuvs (-f rawvideo) generated with -idct 2 and 6 of this video.

Also is this sparc or x86 ?

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The misfortune of the wise is better than the prosperity of the fool.
-- Epicurus
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