When bandwidth is exceeded, the funnel backs up. Video and audio are bandwidth intensive. They have a free server for up to 50 streams. He encoded it for 28.8 modems. He got a clean sound capture, without side noise, that compressed well.
Compression also compresses noise.
A shotgun mike in a classroom captures the sound but usually has a lot of noise and doesn't produce good sound. Also, VHS tapes don't provide good quality. You can link html pages with sound, but sometimes pictures don't download fast enough. Mark is looking at Java to download pictures first. For 56KB encoded video, encode with the RealVideo high quality option.