| ableton is not a full blown video editing program (yet, anyway), but it does allow you to drop in video to score to.
you can do minor editing and even video warping to a degree (at least with version 8),
but imho you are better off using a dedicated program
like final cut pro (if on mac).
i generally score to mpeg4 clips in live, then export the sound and render with the source video at a better resolution, then compress video from there. | 
