CitarMotionPerfect can change the speed, frame-rate and run-time of an AVI video.  In each operation, MotionPerfect calculates and interpolates motion within the video so all newly computed frames have all objects moved to the proper placement within new frames.  

This means that slow-motion has smooth movement – no matter how slow.  MotionPerfect can also compute and fill in new frames to change a jump low frame rate video into a smooth full-frame rate video.  It can even automatically repair videos by replacing missing and dropped frames.

It's great for converting NTSC-PAL frame rate conversion or to smooth out a choppy video you got from a web-cam