Standard Definition (SD) is 480p or in 4:3 format 640x480=307200pix.
High Definition (HD) is 720p or in 4:3 format 960x720=691200pix or in wide screen (16:9) 1280x720 or 921600 pix. Encoding/decoding is proportional to number of pixel per frame and thus, “upgrade“ from 4:3 SD to to 4:3 HD is 225% more expensive and to 16:9 HD is 300% more expensive.
On 448 Mhz test CPU most trivial case of CBR encoding gave the following result
| Size |
XviD |
x264 |
| 480x360 |
5fps |
3fps |
| 640x480 |
3fps |
2fps |
thus AVS requires at least 50% more power when it comes to encoding. This could be roughly translated into the following CPU requirements for real time encoding.
| Size |
XviD |
x264 |
| 480x360 |
2.2 GHz |
3.8 GHz |
| 640x480 (480p) |
3.5 GHz |
5.5 GHz |
| 960x720 (720p) |
7.8 GHz |
12 GHz or(dual 6 GHz) |
| 1280x720 (720p wide) |
10 GHz |
16 GHz |