I made (with my camera) a HD1080 movie of 11 minutes which was 1.5 GB large. I downloaded a HD1080 movie of 45 minutes from Youtube which was around 750 MB large. They both are in 1080. Why is there such a difference in size? They're both .mov files at the end. Four times longer and half in size makes no sense to me. Mov is mov isn't it? Paul Moortgat