Movie Studio HD Platinum 10? I'm pretty sure that the size of the Youtube video frame is 852 x 480. I can go to properties and change the dimensions of the video I'm making to 852 x 480. When I try to save the video to my hard drive, I'm asked what format I'd like to save the video in. However, when I select a format, it displays the dimensions in which the video will be saved, and it's never 852 x 480. Mpeg got pretty close with 860 x 480, though.