[XviD-devel] question about the decoder+slice rendering

[Michael Militzer]

Hi,

yes, I know it's slow. However it's already much faster than the original
version I wrote in May. So I think you won't get the c-code much faster
anymore - meantime I also have a faster PC now than in May and together
with the code optimizations, I'm quite happy personally ;-))

Also I think that the quality of the postprocessing is pretty nice and
that is because we treat each single edge pixel individually. This however
makes it very hard (if not impossible) to create a MMX version that runs
faster than the current c implementation. I have some other ideas how
to reduce the complexity of the deblocking process, however I need to
check first if I can retain the same quality level then.

You can expect some more new postprocessing stuff soon that should
further enhance the quality (and maybe speed as well). BTW: What kind of
resolution did you try to decode on your Athlon? 263% cpu usage sounds
very high, because I was able to decode a 640xXXX sequence with post-
processing in real-time on a PIII 1.1 GHz.

bye,
Michael


Quoting elcabesa <elcabesa at inwind.it>:

> wow
> i tryed your new postprocessing filter and it work very well.
> do you think will be possible to meke it faster? or should we wait for a asm
> 
> rewrite?
> i tested it with a athlon 900 and mplayer told me that video decoding need 
> 263% of cpu time, so i'll never will be able to use it. i looked inside code
> 
> and found not a way to have it fast, maybe some small enanchement but i think
> 
> it oculd not make big difference.
> without deblocking cpu time goes down to 10 15 %
> 
> On Thursday 11 December 2003 18:20, Michael Militzer wrote:
> > Quoting Edouard Gomez <ed.gomez at free.fr>:
> > > elcabesa (elcabesa at inwind.it) wrote:
> > > > hi i was looking new code and i saw that postprocessing is not
> compiled
> > >
> > > when i
> > >
> > > > run make
> > > > i tryed a make clean a
> > > > autogen.sh
> > > > configure.sh
> > > > but postprocessing files arent compiled
> > > > i think that makefile shoudl be updated
> > >
> > > sources.inc  is already up  to date  since yesterday,  "cvs up"  and try
> > > again. (a cvs  diff on my working  dir doesn't show any diff  to the cvs
> > > and i'm sure it compiles this file: C: image/postprocessing.c)
> >
> > and while you're at updating your sources, just do it once again ;-) I
> > forgot to add some code to xvid.c in order to initialize the postproc
> > tables - fixed now...
> >
> > bye,
> > Michael
> > _______________________________________________
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> > XviD-devel at xvid.org
> > http://list.xvid.org/mailman/listinfo/xvid-devel
> 
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