Splitting DVD-9 video to DVD-5

[Reuben D. Budiardja]

Hello,
I am trying to find a way to backup my DVD movie. A lot of HowTo talks about 
shrinking and requantising (sp ?) the movie so that it'll fit to a single 
layer DVD-R. However, I want instead to just keep everything in the main 
feature (the video steam, audio streams, subtitles) and somehow record it to 
two single layer DVD-R.

I can copy just the main feature of the a DVD video using dvdbackup. Then I'll 
get a set of VOB files, for example: 
VTS_01_1.VOB
VTS_01_2.VOB 
... 
VTS_01_8.VOB

Now here I got stuck. It seems that I need to do is just burn VTS_01_[1-4] to 
a the first DVD-R, and burn the rest to the second DVD-R. But I need to 
generate the correct IFO and dvd structure for those VOB. What tools can I 
use to do that ? 

I've look at dvdauthor but could not figure out if it will do what I want, or 
how to do it. I tried to just cat-ting the a set of VOBs, then run it pass 
dvdauthor to see if it will create a correct DVD structures with the IFOs 
files, but it complains about "SCR moves backward ... " and asked me to 
re-multiplex. So I got stuck there.

Any help ?

Thanks in advance.
Reuben D. B