In light of this issue of not being able to Add Audio during this process, I'm trying to go from a VOB to PSP h.264. I'm feeling like a big idiot because I cannot find a way to determine which audio track is correct before spending the time encoding to find out if I guessed right or not. The stream numbers from the terminal output don't match up with the numbers from the Audio Track dropdown, and in the case of a few VOBs, the audio streams appear to be on channels 10, 11, and 12, and the dropdown only goes to 9.

Can someone point me in the right direction so this is less cryptic? Please, remove muh dunce cap for me.