A few more bits of information. Technically mpeg 1 is dvd compliant though you will liklly never see it as the quality is so low. Also, if you look at the files on a dvd, the vob's are the mpeg 2 files. You can literally change the file extention from vob to mpg and back, as it is the same file type. That might be usefully to know if you are processing home movies and such.