Streaming video files are large. The streaming video worked fine on my College's Intranet, but not on the Internet. Access speeds are simply too slow and they are likely to stay that way for quite some time. There are other problems. Synchronizing the pages that appear behind the streaming video box is difficult.
Good audio demands good recording equipment.
So does good video. A single CD may not hold an entire lecture if you want to make the lectures available off-line. After several frustrating months and only one lecture online I gave up. I gave up on streaming video when I came across a different technology that I thought would work better. I first saw it used as a desktop application on an Information System colleague's desktop.