[XviD-devel] Decoder performance

[Michael Militzer]

Hi,

which encoding features are used for this 'matrix-trailer.avi'? Qpel,
bframes? Or just simple profile only?

bye,
Michael

Quoting Edouard Gomez <ed.gomez at free.fr>:

> Hello,
> 
> I am  working hard on making  good xvid devapi4 support  for linux apps.
> Elcabesa released his  sources for mencoder/mplayer a long  time ago and
> i'm actually working  on the mplayer decoder module  (the encoder module
> is already finished and fully functional).
> 
> I  must admit  i had  a very  bad surprise  looking at  XviD performance
> compared to libavcodec... 
> 
> I ran mplayer with this cmd line:
> mplayer (-vc xvid) -vo null -nosound -benchmark matrix-trailer.avi
> 
> XviD CSP YV12/I420:
> BENCHMARKs: VC: 77,105s VO: 0,020s A: 0,000s Sys: 1,529s = 78,654s
> 
> XviD CSP INTERNAL Buffers (that's a bit faster):
> BENCHMARKs: VC: 68,771s VO: 0,018s A: 0,000s Sys: 1,732s = 70,520s
> 
> libavcodec (that's a lot faster):
> BENCHMARKs: VC: 27,239s VO: 0,014s A: 0,000s Sys: 3,127s = 30,380s
> 
> I  remember  XviD not  being  so  slow in  the  near  past,  is there  a
> significant change  in the  decoder that  could make it  so slow  now (2
> times slower than libavcodec) ? 
> 
> I'm probably  going to  do some profiling  to spot the  bottlenecks, but
> giz, two times slower...
> 
> --
> Edouard Gomez (surprised)
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