This is how I can put robin hood two side DVD in one
first you need to rip both sides
Put the vob
s in a separate folder, the B side vobs must be renamed like this: VTS_01_05, to VTS_01_08. Next you need to create new Ifos using Ifoedit, close it and open the new VTS_01 IFO and Get VTS sectors and then you need to get VOB extras.
When finished remove the old VTS and BUP and move the new files to the this folder. Next run DVD2ONE and compress the 8 VOB.
Done, you have a complete movie that can be burned in one DVDR.
Hope you can succeed.