I've got a bunch of MKV files with surround sound audio tracks (mostly DTS 5.1) that I'd like to convert to M4V so I can import them into iTunes. I've tried a few conversion appsSubler, iVI, iFLicksand the resulting files seem to have 2 channel audio. Am I correct? Can iTunes play any surround sound formats? If so, what settings in any of those apps should I use?