yeah mate downloaded from isohunt avi or divx movies they play ok on my media player when i convert them and burn using sothink dvd maker they play on my home dvd players but with no audio thanks pal miguel2010
When i have avi, mpeg files i want onto DVD, i use ConvertXtoDVD - very straight forward to use and have never had a problem.
You just select the files you want converted, and it does it for you - all you need to do is create your menu and make sure there's a blank DVD in the drive.
Like i said, i've never used sothink dvd, but give what i suggested a try, see how you get on.