I am trying to use ConvertXtoDVD to make a DVD from a MKV and want to maintain all the subtitles from the MKV. Without extracting the subs I lose all formating, so I extracted them and made them .ass. When I bring that into ConvertXtoDVD it splits it into 4 streams. I want to play all 4 at once.

Streams 1 and 2 are the opening. 1 (Latin) is displayed on the top, 2 (English) is displayed on the bottom.
Stream 3 is the main portion of the movie.
Stream 4 is part of the main movie (I think) and the closing.

I also tried extracting the 4 separate streams into .idx/.sub format with ImTOO DVD Subtitle Ripper, and tried using the VobSub joiner - it fails.