5.1 DTS speed change in OS X

So I've searched high and low, and I can't figure this shit out.

I have a 5.1 DTS file that's sycnhronized to 23.976 video.  However, I need to convert it to sync to 25fps video (I've already successfully converted the video, so I don't need to worry about that).

So what I'm looking for is either an easy way to convert it, keeping the 5.1 and the DTS encoding, or a way to split it into six mono WAVs that I can then convert, and then join back together into a new 5.1 DTS file (though I guess I can deal with a 5.1 AC3 in the end if it has to be done that way).

Oh, and I'm in Mac OS X 10.5.8 right now.  I'd love to be able to do all this within OS X, but if I have to I can jump over into Windows 7.

Don't know about a Mac and I have never done it myself, but I am almost certain that eac3to can do it on a PC.  You would need to have Surcode (or whatever) installed.  If I were in your situation I would go to AC-3 5.1 at 640kbps: it has always sounded good enough to me, so I have never felt the need to invest in a DTS encoder.  I understand that you want DTS though, and it should be possible.

23.976 to 25fps?  Why would you want to turn gold into lead?  (kidding) :-D

The reason is that the director of the film (Into the Void) has said that he would prefer for viewers to see his film at 25fps instead of 24, but all Blu-Ray releases are at 23.976.  I haven't seen the film, but I would like to, and I'd like to see it the way the director intended for me to see it.  That, and it makes the movie about 6-8 minutes shorter, and from what I hear of this movie, it's already too long.

Plus it gives me an excuse to test out my roommate's projector's capabilities, which can apparently display NTSC or PAL at the intended framerate.

I'll try out your method, but I'd really like to keep the DTS encoding if at all possible.

That's interesting, CSA!  You should be able to use eac3to to do it, but as far as I know there are no free DTS encoders, so unfortunately you will have to pay.

Ah, I see.  That's disappointing.  I'll check out eac3to, thanks for the suggestion.