If your MPG files are VCD or SVCD compliant, Nero will accept them automatically. If not, you've got to reencode them so that they become VCD or SVCD compliant and so your DVD player can eat them :D Before burning in Nero, you have the chance to build a menu, where you can make as many selections as many files you have to burn, with background picture and thumbnails and all, pretty cool the whole thing ;)