To make web videos, I upload to YouTube and use the HTML embed code to put a video on a website. That's great, but now I would like to make videos that use FREE tools and can do green screen filmography like you see a weather reporter do. Does anyone know FREE Chromo Key resources that work with MP4 files. Windows creates files in MP4 using the Windows Movie Maker and it's free, so I would like to stick with that for now. I am willing to make changes if the resource is free or open-ware.