Everytime I finish a final profect, it looks fine in Real Player, but when I load it onto You tube, it takes on a grainy appearance. I've tried .avi(too large), .mpg4(grainy), and .mpg(grainy).

What is the best approach to take with AS to get a clean, smooth video?? Is it compression? (I was told not to use any by AS support) but that doesn't seem to answer my problem. There has to be some sort of reasoning besides "trial and error". But if that's it, I live with it.
Please give some feedback on what you think (and I'll keep searching this forum to find a possible solution).
Sincerely,
LC