[Ffmpeg-devel] libavcodec + IPP

Guillaume POIRIER poirierg
Tue Nov 8 22:48:07 CET 2005


Hi,

On 11/8/05, Michael Niedermayer <michaelni at gmx.at> wrote:
> Hi
>
> On Tue, Nov 08, 2005 at 09:36:56PM +0100, Matthias Wieser wrote:
> > Am Dienstag, 8. November 2005 13:45 schrieb Bj?rn Ard?:
> > > Hi,
> > >
> > > We have done some performance tests with libavcodec on an intel pentium
> > > 4 CPU uncompressing a mpeg 2 video stream.
> > >
> > > We noticed that we could replace the idct algoritm with the
> > > corresponding IPP function. This increased the performance by about 10%
> > > compared to the MMX2 version in libavcodec (FF_IDCT_LIBMPEG2MMX).
> >
> > Is it faster on an Athlon, too?
>
> ill bet they check for athlon and disable all optimizations then, its
> intel after all ;)
>
> [...]
> --
> Michael

Just like they do with their compiler:
http://yro.slashdot.org/comments.pl?sid=155593&threshold=1&commentsort=0&tid=142&tid=118&tid=123&mode=thread&cid=13044057


Guillaume
--
Reading doesn't hurt, really!
  -- Dominik 'Rathann' Mierzejewski





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