QuickTime may also create a forced key frame when it detects a 90 percent or greater difference between the current frame and the previous frame. When mastering your movie to CD-ROM, you can use the Movie Analysis and Data Rate Analyzer tools to analyze your finished clips and help you choose the right compression method for your distribution and playback needs. You can also use the CD-ROM Movie Maker to optimize your audio and video blocks for the best possible playback from the media you will be using. Video Video, the most popular scheme used by systems not employing hardware compression, is an image compression method developed by Apple to permit fast compression and decompression while maintaining good picture quality. Use Video for live video images.
Video supports both spatial and temporal compression.
Temporal compression is enabled by activating key frames. For best video quality, set your key frame option to match your sample rate. The compression and decompression speed varies with CPU performance. Performance degrades as the CPU and disk speed decrease. Cinepak Cinepak, or Compact Video, is a scheme similar to the Video compressor but is considerably slower.