Well, it’s finished now – the status bar must have been wrong – but it still took 36 hours for a 2GB-DVD…
By the way, probably a bug: The sound wasn’t alright with two videos, most probably, as I’ve later realized, due to the fact that there was no more space on the drive with my project. So I marked those problem-videos as “Untranscoded”, started building the dvd again but it still had the same problems. I have now deleted those transcoded files on my harddrive and even the cache and hope that with my next version this should be fixed. But this should have happened by marking “Untranscoded” before, shouldn’t it?