Laserschwert said:

Ah well, I didn't demux first... but ffdshow was definitely the crux. It's running now, although probably taking a couple of hours still. As I'm heading to bed now anyway, I'll just leave it running. We'll see how that goes.

I just tried to create a BD with TsMuxer myself. Well, even without demuxing first it didn't throw any error and the resultant BD folder plays flawlessly with TMT5. The process took less than 30min to finish. However I don't have ffdshow installed...