[XviD-devel] [In progress] devapi4 -- mpeg matrices

[Edouard Gomez]

skal (skal at planet-d.net) wrote:
> 	Sure, no pb. But beware:
> 
> 	a) i'm not sure it's bug-free (especially the h263 (de)quant)

Ok i  integrated the C  part of your  code to XviD  and i get  a strange
result with  mpeg4 quantization  (using your C  code, not  the reference
one).

===============================================================================
Test name: underworld-trailer
Using cached first pass stats (hash - a1c5ab3ce4420b302dd41ee9886379ea)
 
Results:
xvid:     Min PSNR y : 30,13 dB, u : 38,08 dB, v : 39,42 dB
xvid: Average PSNR y : 38,72 dB, u : 42,98 dB, v : 45,27 dB
xvid:     Max PSNR y : 99,99 dB, u : 99,99 dB, v : 99,99 dB
===============================================================================

I was getting  39.11 dB on average  with the old code. Before  I go into
deep debugging,  did you  sacrifice some precision  step that we  had in
XviD ? (if  i remember correctly, you're also the author  of the C quant
code of xvid).

-- 
Edouard Gomez