I make my home videos in HD(V), mostly 1920 (or 1440) X 1080. Do I need to downsize them all to 720 for an AppleTV to be able to play them? I'm considering buying one to easily play home movies at home. Right now I play them directly from my Mac Pro via Blackmagic Intensity pro card with HDMI out. I'd like the family to have easy access to them but hope that I don't have to re-size all of them. Thanks.