If you want the safety of legality (ripping your own DVDs/Blu-rays) or converting home videos, here is the for getting the "Hot" 100MB result using HandBrake :
than the older H.264 standard, compressing a full-length 1080p movie into just 100MB results in extreme quality loss. Video Artifacts
: It predicts pixel changes between frames with extreme accuracy. The Anatomy of a 100MB Movie