[FFmpeg-devel] pixel format convertion?yuv422p- >yuv420p->yuv411p->yuv422p degrade picture

[Michael Niedermayer]

On Wed, Jul 16, 2008 at 10:51:15PM +0200, Ivo wrote:
> On Wednesday 16 July 2008 16:01, Maksym Veremeyenko wrote:
> > Ivo ???????(??):
> > > On Wednesday 16 July 2008 13:18, Maksym Veremeyenko wrote:
> > >> What tests more should i make?
> > >
> > > As Michael Niedermayer already asked, it would help to know whether you
> > > used the old converter or swscale (compile with ./configure
> > > --enable-swscale).
> >
> > my all tests was done with binaries compiled with --enable-swscale :
> >
> > FFmpeg version SVN-r12665, Copyright (c) 2000-2008 Fabrice Bellard, et
> > al. configuration: --enable-gpl --enable-postproc --enable-swscale
> > --enable-avfilter-lavf --enable-pthreads --enable-liba52
> > --enable-avisynth --enable-libfaac --enable-libfaad --enable-libgsm
> > --enable-memalign-hack --enable-libmp3lame --enable-libnut
> > --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid
> > --cpu=i686 --extra-ldflags=-static
> >    libavutil version: 49.6.0
> >    libavcodec version: 51.54.0
> >    libavformat version: 52.13.0
> >    libavdevice version: 52.0.0
> >    built on Apr  2 2008 22:35:11, gcc: 4.2.3
> >
> > I will try in a few hour test against version compiled without
> > --enable-swscale
> 
> Ok, looks like it's only swscale that shows this problem. What happens if 
> you enable accurate_rnd or disable mmx, mmx2, 3dnow, et cetera 
> (see -sws_flags command line option, it might help to localize the exact 
> point of failure).

Also feel free to open an issue on roundup so that this isnt forgotten in
case we dont come to a conclusion/solution about this.
In principle the drift is rather irrelevant but i do not like that swscale
is "worse" than the old scaler.

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

Many things microsoft did are stupid, but not doing something just because
microsoft did it is even more stupid. If everything ms did were stupid they
would be bankrupt already.
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