This guide worked pretty well, except I had an issue with Titanic.
When using rejig to author disc 2 (I reauthored disc 1 and 2 of the 10th anniversary edition separately) I ended up with just a few kilobytes of data in my AUDIO_TS/VIDEO_TS directories.
To work around this I did the following:
-While rejig is authoring, quit just before the multiplexing is done. Then I had a vob file of the disc in the output directory, it cut off when I quit so I may have lost a minute or two of credits.
- Use DVDStyler to generate an ISO from the vob. I just dragged the vob and dropped it into the bottom window. I have a basic menu with a Play All button that goes to the vob.
Other than this disc, I re-authored a few movies without problems. A couple other tips I have come across,
-You can import the AC3 file directly into audacity. The channel order in audacity is L R C SUB SL SR
-Use autoduck in audacity. Put rifftrax on the bottom, then highlight all the other audio, Click Effect - > AutoDuck. I use .1 second for the time in/out of ducking and -10db duck.
-Make sure you Stop the audacity play back before trying to do any action like cut, Effect, etc. If you just pause instead of stop, you wont be able to do anything.
-When exporting audio from audacity, choose 6 chanels, keep the same channel order and add the rifftrax audio to whichever channels you want (I did 1,2,3)