I had 2 avi's for a movie that has 5.1 audio and joined them together to make one avi. I used VirtualDubMod they joined fine It plays fine on my PC....and thought cool....ok...now I'll use ConvertXtoDVD to make a DVD. I've used convertxtodvd for a year or so and I've never had a problem with it before, but when I tried to convert the joined avi with convertxdvd, It burned ok....it plays on my PC but not on my DVD players? why is this? like I said before....I've used Xtodvd to burn avi files before with no problem....why isn't it working now? I'm thinking when I joined the avi files together it changed the codec or something. I'm not sure why?? I need help with this.