How do you make your own video widescreen for youtube?(on windows movie maker)?

Mitchell Davis is a YouTube "partner" and professional video producer. He has more than 100,000 subscribers, and his YouTube channel page has over 3,000,000 hits. He can thus probably afford some fancy, top-of-the-line video equipment. The video you are referring to is 480x300, which means it has an aspect ratio of 1.6:1 (or 16:10 instead of 16:9). Paramount's VistaVision cameras used to be like that, but I doubt he used that. He probably used a standard high-quality DVR (digital video recorder) which typically has an aspect ratio of 3:2 (usually 720x480 rectangular pixels). He then most likely scaled his own video down to 480x320, and then lopped off part of the top/bottom.

When you press Save on the Computer. It will say best quality for playback. Change it for DVD Quality Widescreen (3 mps) or something like that ;)