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April 7, 1998
First, you will want to go through your content carefully and pick video clips that are well suited to compression. High-motion clips that contain lots of movement from frame to frame are difficult to compress and will result in a lower frame rate, jerkier motion, and lower frame quality. Low-motion clips that contain smaller changes from frame to frame will compress much better. For example, over a 28.8-Kbps connection on the Internet, it would be virtually impossible to host a basketball game, where the movement from one side of the court to another would be high. However, broadcasting a reporter or announcer's audio and video (a "talking head shot") would compress well and the quality would be good over the Internet. Realize that due to bandwidth limitations, some of your content might not look great (or even be viewable) at lower bandwidths.
Therefore, think carefully about the audience for your video content, and what bandwidth connections you are targeting. The following table shows what you can expect your audience to be able to view at various bandwidth levels:
| Network | Bandwidth | Target Data Rate (Usable Bandwidth) | Capabilities |
|---|---|---|---|
| 14.4 Kbps | 14,400 bps | 9,600 bps | Compressed audio, script commands, markers, URL flips |
| 28.8 Kbps | 28,000 bps | Less than 24,000 bps | (all above) small frame, still images, low frame rate, highly compressed video, compressed audio |
| 56.6 Kbps - 128 Kbps, ISDN | 56,000 bps | ~53,000 bps | (all above) compressed stereo audio, compressed video, faster frame rates, larger frame sizes |
| Intranet | 110,000+ bps | ~100,000 bps | (all above) larger and faster video, higher-quality audio |
| Fast Network | ~210,000+ bps | ~190,000+ bps | (all above) uncompressed audio |
| T1 | 1.544 Mbps | (all above) uncompressed stereo audio | |
| T3 | 40.144 Mbps | (all above) uncompressed video |
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