SMP
Source video 1
The video is a 95 minutes 720x480 16/9 NTSC dvd movie. The raw mpeg2
video stream and the ac3 audio stream is 3699878452 bytes long. The
computer has two cpu with hyperthreading.
-encode
|
-cpu
|
hyperthreading
|
kernel
|
size
(bytes)
|
job
time |
PSNR |
3:2:1
|
1
|
off
|
2.4
|
2869812542
|
1h16m
|
46.60
|
3:2:1
|
2
|
off
|
2.4 |
2871568120
|
0h56m
|
46.60
|
3:2:1
|
4
|
on
|
2.4 |
2874968680
|
0h54m
|
46.62
|
3:2:1
|
1
|
off
|
2.6 |
2869812542
|
1h19m
|
46.60
|
3:2:1
|
2
|
off
|
2.6 |
2871568418
|
0h56m
|
46.66
|
3:2:1
|
4
|
on
|
2.6 |
2874967188
|
0h52m
|
46.80
|
with 0 B frames
-encode
|
-cpu
|
hyperthreading
|
kernel
|
size
(bytes)
|
job
time |
PSNR |
3:3:2
|
1
|
off
|
2.4
|
2323792246
|
4h41m
|
45.61
|
3:3:2
|
2
|
off
|
2.4 |
2324400752
|
3h01m
|
45.61
|
3:3:2
|
4
|
on
|
2.4 |
2342798810
|
3h04m
|
45.62
|
3:3:2
|
1
|
off
|
2.6 |
2323792246
|
4h37m
|
45.61
|
3:3:2
|
2
|
off
|
2.6 |
2324341826
|
2h53m
|
45.61
|
3:3:2
|
4
|
on
|
2.6 |
2326579764
|
2h39m
|
45.67
|
with 2 B frames
-encode
|
-cpu
|
hyperthreading
|
kernel
|
size
(bytes)
|
job
time |
PSNR |
3:3:2
|
1
|
off
|
2.4
|
1669502912
|
6h18m
|
44.54
|
3:3:2
|
2
|
off
|
2.4 |
1695440922
|
9h16m
|
44.50
|
3:3:2
|
4
|
on
|
2.4 |
1721917064
|
13h36m
|
44.51
|
-encode
|
-cpu
|
hyperthreading
|
kernel
|
size
(bytes)
|
job
time |
PSNR |
3:4:2
|
1
|
off
|
2.6
|
2975708584
|
12h21m
|
47.57
|
3:4:2
|
2
|
off
|
2.6 |
2998988364
|
7h10m
|
47.55
|
3:4:2
|
4
|
on
|
2.6 |
3038059572
|
6h10m
|
47.55
|
Comments
If you have more than 1 physical cpu, you have a gain in speed of about
25-40%. If you are using B frames, always use -cpu 1. If your cpu has
hyperthreading, use kernel 2.6.x.