you should read the info on the link I posted above. Anyway, if you have a DVD folder on your computer, you will open the .IFO file from there with PGCdemux. You click on titles (as opposed to menus) on the right side of the program, and choose your video from the dropdown menu. You will know which one by the duration indicated. On the right side of the app, click on demux video and demux all audio streams. click OK, and it runs. you can then load the separate video (.m2v) and audio (.ac3 or .mp2) into your DVD authoring software