You can convert the file to MPEG 1 at the frame size you mention using Digital Media Converter. Select "Custom MPEG 1" as your Convert To format. To create MPEG 4 files, we would recommend your using the Pro version. Digital Media Converter Pro can perform both tasks, and it is also faster than Digital Media Converter. You can download a free trial version of Digital Media Converter Pro here: https://www.deskshare.com/download_details.aspx?ID=30