Problem with playback after converting to VOB's

Ok, I am trying to backup my dvd movies stored on the computer which are saved under avi, mpeg, divx, etc.

Ive used software to convert the audio to ac3 and the video to m2v.

When I use TDA (TMPGenc DVD Author) to conver the files to VOB's in VOLUME 1 folder, I then use Nero Burning Rom to burn the final project to dvd cd's

Ive noticed only 30 mins of the movie plays back and thats it.

Its weird. The audio file is like 25.5 mbs long and the video m2v file is like 4.77 GB's long but when I combine them in Nero, the size in length is only like 550mbs long

In TDA, Im curious.... Do you HAVE to drag the frames over to the chapter TDA creates?

Ive notced that when it burns in Nero, it only creates one chapter thats only 30 mins long.

Why does it do that???