[XviD-devel] New Trellis Quant

[Christoph Lampert]

On Sun, 11 May 2003, Edouard Gomez wrote:
> I had a few settings i found being rather good.

Hm, I tested your settings, but it only supports my prejudices against
BITS for search:

My first test: twopass, 352x240 Enterprise Clip,  384kbps

Q0 fps = 25.58, length= 1882, psnr y = 40.92, u = 46.10, v = 47.64
Q1 fps = 24.38, length= 1882, psnr y = 41.03, u = 46.18, v = 47.77
Q2 fps = 16.78, length= 1888, psnr y = 43.85, u = 46.67, v = 48.22
Q3 fps = 15.14, length= 1888, psnr y = 43.91, u = 46.67, v = 48.22
Q4 fps = 13.16, length= 1889, psnr y = 43.91, u = 46.78, v = 48.38
Q5 fps = 15.06, length= 1885, psnr y = 41.09, u = 46.25, v = 47.90
Q6 fps = 13.37, length= 1884, psnr y = 43.12, u = 46.59, v = 48.21

Q5/Q6 seem to terminate too early (fast, but bad).


The same with new Trellis activated for all:

Q0 fps = 20.61, length= 1881, psnr y = 41.15, u = 46.18, v = 47.73
Q1 fps = 19.12, length= 1889, psnr y = 41.27, u = 46.24, v = 47.82
Q2 fps = 15.89, length= 1888, psnr y = 44.21, u = 46.86, v = 48.48
Q3 fps = 14.85, length= 1888, psnr y = 44.27, u = 46.88, v = 48.51
Q4 fps = 11.78, length= 1891, psnr y = 44.26, u = 46.96, v = 48.60
Q5 fps = 15.68, length= 1883, psnr y = 41.38, u = 46.35, v = 47.99
Q6 fps = 12.63, length= 1886, psnr y = 43.49, u = 46.76, v = 48.40

Still BITS for search is fast, but bad compared to the others. 


Anther clip (Simpsons Intro, 256kbps), same behaviour:

no trellis

Q0 fps =  22.85, length= 1208, psnr y = 34.57, u = 38.10, v = 38.22
Q1 fps =  20.00, length= 1204, psnr y = 34.63, u = 38.16, v = 38.26
Q2 fps =  16.10, length= 1221, psnr y = 37.80, u = 38.74, v = 38.89
Q3 fps =  13.56, length= 1220, psnr y = 37.81, u = 38.72, v = 38.88
Q4 fps =  10.76, length= 1218, psnr y = 37.93, u = 39.30, v = 39.40
Q5 fps =  15.15, length= 1206, psnr y = 34.93, u = 38.62, v = 38.69
Q6 fps =  10.52, length= 1210, psnr y = 37.59, u = 39.17, v = 39.25

with trellis

Q0 fps = 21.23, length= 1195, psnr y = 34.73, u = 38.30, v = 38.38
Q1 fps = 19.73, length= 1194, psnr y = 34.77, u = 38.31, v = 38.48
Q2 fps = 14.34, length= 1206, psnr y = 37.90, u = 39.01, v = 39.18
Q3 fps = 13.30, length= 1209, psnr y = 37.93, u = 39.04, v = 39.18
Q4 fps = 10.47, length= 1203, psnr y = 38.08, u = 39.47, v = 39.59
Q5 fps = 14.18, length= 1196, psnr y = 35.04, u = 38.73, v = 38.85
Q6 fps = 10.25, length= 1193, psnr y = 37.74, u = 39.29, v = 39.45


Do you have examples where BITS-search performs really well? Or am I doing
something wrong?

gruel