What is your question?

If the main feature is all you want and it is 4.0 gig. You don't need to shrink it, but using my script, DVRequant, just above on you DVD it will skip the shinkiing part because unnecessary but it will fetch the origianl chapter list and re apply them to the output file.

So you will have your movie with the origianl chapters but no menu.

I have followed your article on converting a DVD9 to DVD5. Here is what I did:

1)Rip the DVD title(s) to harddisk with DVD:RIP in a project folder. This will create VOB files of the chosen title in that folder containing the movie and the soundtrack you picked.
2)Concatenate (merge) those VOB files into one by running in a console:

cat *.vob > movie.vob
3)demutliplex movie.vob and get the M2V and AC3 files out of there.

tcextract -i movie.vob -t vob -x mpeg2 > movie.m2v

4)tcextract -i movie.vob -a 0 -x ac3 -t vob > movie.ac3

5)I then shrank the movie.m2v

tcrequant -i movie.m2v -o shrinked.m2v -f 1.5

6)re multiplex those 2 files into a compliant DVDauthor file:

mplex -f 8 -o final.mpg shrinked.m2v movie.ac3

And then I get this:

INFO: [mplex] mplex version 1.9.0 (2.2.7 $Date: 2006/02/01 22:23:01 $)
INFO: [mplex] File shrinked.m2v looks like an MPEG Audio stream.
INFO: [mplex] File movie.ac3 looks like an AC3 Audio stream.
INFO: [mplex] Found 2 audio streams and 0 video streams
INFO: [mplex] Selecting dvdauthor DVD output profile
INFO: [mplex] Multiplexing video program stream!
INFO: [mplex] Scanning for header info: Audio stream c0 (shrinked.m2v)
Floating point exception

How can I fix a floating point exception or did I do something wrong?

I'm using Debian Wheezy AMD64
I just tried to requantify an m2v file that I'd created(because it produced a DVD too big for a 4.7G DVD) using tcrequant. It is not there, even though I have transcode. It has been deprecated, I believe, because it may be broken. I have transcode 3:1.1.5-0.8.
Does anyone know of an alternative to transcode