Is this possible?

[apollo]

Is it possible to reduce the size of a movie which is over 4.7gb and still retain the Dolby Digital soundtrack.

What im talking about here is after the vobids have been stripped etc and im just down to the movie itself but it is still over 4.7gb.

[bugster]

There are some very good guides about this very issue over at doom9.org. Take a look there.