cutting out certain parts of a dvd when copying

[mhzz]

Not sure if this is the right place to post this but i am wanting to cut out certains parts of a movie when i am copying it. At present i use dvd decryptor to rip the movie then if it is a dual layer i used instant copy to convert it so it will fit on a normal dvd. What i would like to know is if there is anyway to for instance remove previews and other frames from the movie?

[FOO]

DVD Shrink will remove some of the front and back easily.
Sections from the middle are harder.

[housepig]

You can use ChopperXP to cut scenes from the .vob files.

I haven't tried cutting trailers with it, but I have used it to cut down specific scenes for compilation dvds... should work...