So i've been trying to edit a video frame by frame (basically i'm trying to put a picture over someones face and have the video continue with it covering it the whole time) and i've sort of got the general idea of how to edit it frame by frame, but i can't get it right. The picture either only shows up for a split second then dissapears or it's not in the right place. Can someone tell me how I'd make this easier for myself or give me tips?