[XviD-devel] [CVS commits] decoder speedups and fixed cbr
Bryan Mayland
bmayland at leoninedev.com
Wed Aug 11 16:42:36 CEST 2004
Edouard Gomez wrote:
>So feedback is welcome for:
> - decoding speed between 1.0.1 and HEAD CVS. Here i have an
> average 25% better performance, how is it doing on your
> box?
>
>
Is there a better way to quantifiably test this instead of just
playing an AVI and watching the task manager?
> - test CBR/ABR coding, just to make sure Foxer (and I, his
> tester) didn't miss something important.
>
>
I've run some tests on 320x240 15fps source content, 900 frames,
Constant Q=1 2310 kbps,
XVID 1.0.1, 2 max consecutive BVOPs
Target 1-Pass 2-Pass
300 247 263
700 570 699
1000 831 998
2000 1408 1651
XVID 1.0.1, Bframes disabled
Target 1-Pass
700 700
1000 998
2000 1838
XVID HEAD, 2 max consecutive BVOPs
Target 1-Pass 2-Pass
300 288 263
700 665 701
1000 936 997
2000 1512 1656
Common Options:
H.263 quantizer
Motion Search Precision - 6
VHQ Mode - 1
Chroma Motion Estimation - Enabled
All quantizers set 1-31
I've also looked at every resultant video and they all look as
expected. Something that I thought was odd was that using constant
quantizer=1 that I and P frames used Q=1 but B frames used Q=2. Not
that it makes any difference at that bitrate, but is that intended behavior?
Let me know if there's other tests you'd like me to run.
Bry
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