I was going to mux the original 4.0 mix of Xanadu with the blu-ray video but I ran into a problem. I figured it would be as easy as dropping the DVD audio into the MKVtoolnix since both the DVD and Blu-ray video start on the same exact frame and end with the MPAA rating, but the DVD runs at 29.97fps instead of 23.98 like the blu-ray. The blu-ray video is 10 seconds longer.

Any advice on how I can accomplish this sync? I have all the necessary files already ripped if anyone wants me to upload and share them.

Thanks.