Tim-C is right, G-Spot is spectacular to start, helps with seeing if a video is "corrupt" and where (audio or video). I religiously use WinAVI Video Convert (http://www.winavi.com)....It is forgiving, fast and versatile (many file types)...Not quite as many settings as other converters when going to DVD, just what you need. 1) Go to www.winavi.com/codec.html to resolve the excluded DVD/SVCD filter (not included in download) 2) Put it in \filter directory of WinAVI installation. In options, "Enabled DirectAC3" is default checked. Uncheck this (although it still encodes in AC3...). I used to have problems w/ audio and video being out of sync, but this seems to resolve issue. I also use a program called Video ReDo to cut/recompile (VERY FAST), yet VideoRedo is GREAT for previewing your .vobs and .mpgs (VCD/SVCDs).
IMPORTANT TO KNOW: When using WinAVI to convert anytype to DVD/SVCD/VCD/MPEG-1 or 2, you can convert by desired size (u CAN split if desired), or by desired quality (u can also split here). With VCD/SVCD you can choose desired quality (Highest, higher, medium, lower, lowest). Medium comes out to usually less than original filesize, higher=same or bigger, highest=a little to quite a bit more than original. Test it out (it's a fast program) and c what's best for your desired size output. The only reason I say not to use desired fit/size option is because I got some "skippy" results. I was using a laptop at the time, you just have to test it. I have used both options on my current machine and have had great results all around (just uncheck the Enabled DirectAC3!!).
Hope this helps!