Join MPEG2 files

hi everyone

i like to start a new thread about joining files,
i wanna join mpeg2 files from DVD that's mean VOB files.
you know when you record a dvd movie, it make it in many parts cuz it can't copy it all in 1 file. what i'm trying to do is take these vob files and join them again together on my hard drive, but the problem i'm loosing some frames while i join. i used videoRedo plus to join but like i said i miss like 7 frames between each file.

tell what you know