Table 1. Recommended bit rates for dynamic streaming on demand
| Video size types | Video size | 4:3 aspect size | 16:9 aspect size | Total bit rate (Kbps) | Video bit rate (Kbps) | Audio bit rate (Kbps) | % US broadband consumers* |
|---|---|---|---|---|---|---|---|
| QCIF | 176×144 | 144×108 192×144 | 192×108 256×144 | 48 96 |
32 80 |
16 (mono)
16 (mono) |
Modem and ISDN
2% |
| CIF | 352×288 | 288×216 320×240 | 384×216 384×216 |
300 500 |
268
372 |
32 (stereo)
128 (stereo) |
Low-end DSL
4% |
| D1 | 720×486 | 640×480 640×480 |
852×480 852×480 |
800 1200 |
672
1072 |
128 (stereo)
128 (stereo) |
Faster DSL
25% |
| HD | 1280×720 | – – |
1280×720 1280×720 |
1800 2400 |
1672
2272 |
128 (stereo)
128 (stereo) |
Cable modems
69% |
* Note: Based on the IDC 2008 Consumer Panel Broadband Survey. Each figure represents the percentage of users who have the bandwidth to support the respective total bit rate in that category. For example, 25% of users have bandwidth of at least 1200 Kbps to support the D1 video type but don't have the higher bandwidth needed to support the next higher bit rate of 1800 Kbps.
