natlom

I have been trying to convert a video from avi to mpeg2 for hours to no avail. I open Prism, click add folder and select the video I want to convert, choose output location, go to format drop down ans select mpg I then click on file options and notice mpeg2 in upper right of box. W hen I click on convert itgoes through the process but the output is mpg not mpeg2. What did I do wrong. Please help.