from a Canon HF S100 using HandBrake from www.handbrake.fr and did not notice any "motion blur". If there is fast action in the video capture, it may be due to a 1/60 second shutter speed (that's a long time when things are moving fast). Generally, interlacing artifacts are every-other-line sync issues, not "blur". As well, AVCHD-compressed video and fast motion don't get along well at all because of the way AVCHD compression works... But we can't see what you see.