Missing break point in dual layer dvd iso file
I created a dual-layer DVD using DVD Studio Pro in 2005 and had it mastered using a DLT tape and a facility which produced 1,500 copies of the DVD. I have been selling them on Amazon and now my inventory is down to 11 and I want to convert it to an on-demand Amazon DVD. Amazon wants a .iso file. I had a disk image of the DVD (.img file) as well as folder containing VIDEO_TS and AUDIO_TS folders .BUP, .IFO, and .VOB files in the VIDEO_TS folder. I also have a folder for CMF_100 which contains Layer 0 and Layer 1 folders each containing 3 .DAT files, and a folder for DDP_200 which contains Layer 0 and Layer 1 folders each containing 2 .DAT files and a DDPID file.
Somehow I managed to create a .iso file from something on my Mac. I may have done this before I upgraded to OS 10.15.7 from OS 10.14. I have become so confused by all this that I don’t even remember how I created the .iso file. I think I “exported” it from some application that could deal with the disk image or the folder with the AUDIO_TS and VIDEO_TS folders. When I uploaded .iso file to Amazon Media On Demand, I got a message saying the file was missing its layer break point. They were unable to help me beyond that, and I have been struggling for days to figure out how to add a break point to the file or regenerate the file with a proper break point. I know where the breakpoint was in the DVD Studio Pro project. I can even open the project on an older computer but it no longer builds and gave me an error message that made no sense to me. It said a “story” needed content.
Does anyone have any suggestions for how I can generate a .iso file with a dual-layer breakpoint in an appropriate place? It is important enough to me that I will buy or subscribe to software to get this job done, although I rarely do any video editing and have not created a DVD for several years. Could I do this from one of the DVDs from the production run? Or can I edit any of the files I have to insure that the breakpoint is there?