I'm looking for an app that can capture video from my iSight camera and compress it as it is being captured so that not too much space is taken up. I know Photo Booth and Quicktime Pro can do it but their file size is quite big, approximately 3 seconds per mb according to my calculation. Secondly side question, how long can Photo Booth capture for? Is there like a time or size limit? I would like to capture for around 4 hours straight.