so i shot and edited a short movie with my iphone 4 and edited with imovie for iphone. now ive logged into my youtube account and uploaded the video to my account but now when i try to watch the video it is extremely choppy. did i do something wrong? because the video is definetly not being shown in high def. like do i need to click a tab to upload hd video or something. im sorry to bother you guys but im lost.