Dialhot is right according to the out of standards specs of KVCDs.
But maybe you can patch the header using a osx mpeg header application (I got one in my stock, but as my last OSx encoding is done 1 Year ago I can't name it right now).
Best appl. to author DVD-Rs using OSx is ..... "DVD Studio PRO"!
iDVD is nothing as its (at that time) only supports 90mins of video!
Im still waiting for a portation of DVD Studio Pro to Windows!!

cause of its lovely user interface and design (as known from apple).