Ok, here's a quick and dirty video that shows what I do. I do apologize if I don't go in depth on how to get the Frameserver working with the newest version of Vegas. My son stayed up one night until around 2am or so figuring out how to make Vegas see it. Also, the signpost.avs that I reference (the file I load into MeGUI) simply contains the following:

Code:
AVISource("F:\signpost.avi", audio=true)
ConvertToYV12()