Poor video make awful digital movies. Recording Video with your Camcorder Digitized movies are usually played back in an instructional situation with software. That is, no extra boards are required to play back the movies. Faster PowerPC Macs will decompress faster. This limitation forces compromises in the quality of the movies.
Digital movies place large demands on the playback computer.
Consequently, you need to make your movies as small as practical. The experiment should fill the entire movie screen. If you want a long shot, use a large still if possible, and then display a close-up movie of the important moving part. Save movies for important motion. Don't bother with talking heads.