Part of Sorenson Video Developer Edition. Sorenson Video™ brings the video developer the desired combination of video quality and playback simplicity. Sorenson Video produces excellent video quality from low to high bit rates. The compressed video can play back at acceptable rates even on 486 and 68040 based machines. This developer Edition supports the standard QuickTime compression features as well as the following advanced features: Temporal scalability, Media keys, Automatic key frame detection and Data rate tracking control