Help with ffmpeg and Toast avi to dvd

I have been trying to backup a few .avi files I have onto DVDs and after reading over the forums I have aquired ffmpegx and Toast 8. I place the avi file into ffmpex, encode it with the dvdffmpeg format. But once i burn it with toast, it takes the original wide screen avi file and stretches it to full screen. I tried re-encoding with the DVD 16:9 setting selected with ffmpeg and it seems to look better in a preview, but when I try and burn the Video_TS folder in Toast it gives me the CSS Encryption disk error, which I do not understand because I'm not copying a copyrighted dvd. If anyone can help or direct me to the right place to re-post this please let me know. Thanks.

 

I wish, if I do that then the sound is out of sync. I read about a program that you can use to re-encode the sound into the 48bit or whatever it needs to be to burn correctly with Toast, but when I tried to do it it was taking up about 20 GB worth of space and ran out of room.