fpm	fps	spf
frame	frame	seconds
per	per	per
minute	second	frame
480	8	0.125
350	5.83	0.170~
240	4	0.25
60	1	1
30	0.5	2
20	0.33	3
15	0.25	4
12	0.2	5


				fps
14.4 kbps	1440 Bps	~0.5
28.8 kbps	2880 Bps	~1.0
56.6 kpbs	5660 Bps	~2.0
128  kbps      12800 Bps	~4.0
256  kbps      25600 Bps	~8.0