I’m currently working on adding DVD sharing to Rygel and while doing that, I resurrected a tool I wrote in 2005 to aid the tedious process of authoring DVDs on Linux. Today I cleaned it up a bit, gitified it and pushed it to github: https://github.com/phako/authorg
Please be warned that it might kill your data if you don’t read the message boxes carefully and cancel in time (and I mean that seriously, not as a standard disclaimer).