[dvd::rip] DVD5 to DVD9: .vob files larger when ripped than on DVD?

Hi,

I'm having some curious problems with a dvd I'm trying to rip. I'd
like to make a backup copy of a DVD9 to a DVD5 disc by requantizing
the vobs. This has worked fine for 2 dvds I've done, but I'm having
trouble with the third. When I read the dvd contents using dvd::rip, I
get several titles listed that are clearly duplicates:

http://electron.mit.edu/~gsteele/titles.png

Titles 10-17 are quite clearly duplicate listings of titles 2-9. The
remainder of the tracks are part of the DVD "extras".

Any ideas on where these duplicates came from? The full tcprobe output
from track 2 is here:

http://electron.mit.edu/~gsteele/title02.probe.txt

Another curious feature of this DVD is that there are several "extras"
titles on the disc that are composed entirely of segments of the
earlier main titles glued together. A scan of all the chapter block
info is here:

http://electron.mit.edu/~gsteele/all.blocks.txt

For example, the output of:

for f in `cat block.extras.start` ; do grep $f blocks.titles ; if [ $?
= "1" ]; then echo $f; fi ;  done

gives:

http://electron.mit.edu/~gsteele/extras.glue.txt

Of course, the problem is that if I just try to rip these off the disk
to to .vob files, "dr_exec dvdxchap" will reduplicate all of the
earlier data, making my .vob files larger that the original 7.9 GB:

gsteele@vortex:~/dvdrip/unnamed/vob$ du -shc */*.vob
19M     001/unnamed-001.vob
889M    002/unnamed-001.vob
901M    003/unnamed-001.vob
940M    004/unnamed-001.vob
897M    005/unnamed-001.vob
944M    006/unnamed-001.vob
929M    007/unnamed-001.vob
946M    008/unnamed-001.vob
939M    009/unnamed-001.vob
986M    018/unnamed-001.vob
1.1G    019/unnamed-001.vob
788M    019/unnamed-002.vob
216M    020/unnamed-001.vob
1.1G    021/unnamed-001.vob
93M     021/unnamed-002.vob
442M    022/unnamed-001.vob
12G     total

gsteele@vortex:/dvd$ du -sh `find .`
7.9G    .
2.0K    ./AUDIO_TS
7.9G    ./VIDEO_TS
8.0K    ./VIDEO_TS/VIDEO_TS.BUP
8.0K    ./VIDEO_TS/VIDEO_TS.IFO
12K     ./VIDEO_TS/VTS_01_0.BUP
12K     ./VIDEO_TS/VTS_01_0.IFO
19M     ./VIDEO_TS/VTS_01_1.VOB
246K    ./VIDEO_TS/VTS_02_0.BUP
246K    ./VIDEO_TS/VTS_02_0.IFO
555M    ./VIDEO_TS/VTS_02_0.VOB
1.0G    ./VIDEO_TS/VTS_02_1.VOB
1.0G    ./VIDEO_TS/VTS_02_2.VOB
1.0G    ./VIDEO_TS/VTS_02_3.VOB
1.0G    ./VIDEO_TS/VTS_02_4.VOB
1.0G    ./VIDEO_TS/VTS_02_5.VOB
1.0G    ./VIDEO_TS/VTS_02_6.VOB
1.0G    ./VIDEO_TS/VTS_02_7.VOB
258M    ./VIDEO_TS/VTS_02_8.VOB

I'm happy to just do away with these "extras" for now in my copy, but
it would be nice to have some kind of way of regenerating the
necessary information in the .IFO file to recreate these "extra"
tracks on a dvd that I author: I'm not sure if there is a way to do
this using dvdauthor...

Sorry about the multiple-list posting for those of you that are
getting duplicates of this email.

Cheers,
Gary.

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