getting high def to my mbp in iMovie 08? I have the latest macbook pro 2.4 penryn with 4 gb ram and when I load video from my hv20 to iMovie 08 it gives me 2 options. 1 is large file and the other is full or something, Im assuming this is high def but whn I choose it it gives me a warning that it might cause bad quality on my computer? why is that? I havent tried it to see if it works but is it possible to encode high def from my hv20 to my mbp or do I need a faster computer?