Like I had said further up, I believe its 24/96 DTS, which is the least lossy of all the lossy formats IMO.So that DVD is just the 5.1 mix in lossy formats?
I also have a ripped version from the blueray. It is difficult, if not impossible for me to tell them apart.
Edit: Apparently i'm wrong... looks like 24/48 judging from Gos' info.