If you searched (I don't believe this) you would have found that there were threads where people did the same thing, removed the files holding the information about the video files - gosh, is this "space saving craze" going so far? - then complaining that the player (on PC or on mediaplayers) has problems.
Back to your problem
Decrypt the movie with DVDdecrypter, as you did before.
Then load the decrypted folder in dvdshrink and
either
1. "reauthor a new DVD" by keeping only the needed titles (movies) with selected audios and subtitles
or
2. simply deselect the not needed streams.
Surely, there is another method, but that requires a lot of knowledge, anyway if you wanna try, use SetSTN.
http://forum.videohelp.com/threads/2...e-only-backups