Please enable Pathplayer, load one of the movie disc to Copy-Main Movie mode, copy and save one or two of the extras titles to local hard drive.
Play it using software player like VLC or DVDFab Player 5. If all ok, then load this copy title to Ripper to convert to avi again and see the result.
If still have the same conversion failure, please send us the copy title, we will check and see what cause the problem.
You can upload the copy title to a googledrive and then share the download url with us. Thanks in advance.