DVD with DTS audio only

I have an older DVD, Journey to the Far side of the Sun, and it only has one audio track DTS. The specs on the box list it as DTS/PCM. I am able to rip and copy this move with DVDFab Plat, but I can not convert to mobile. WHen I try no titles are listed. As anyone else seen this? Every other older DVD I have tried works, but of course then have different kinds of audio. SOhould I just forget this one, or does anyone know of a work around. In general I love DVDfab. No problems that have not been addressed quickly by the last couple of beta release.