Been coming across some Blu rays I'm ripping with MakeMKV that only has a Dolby Digital 5.1 audio. What I'm trying to do is setup the movie with a audio track for the television speakers and another track for surround system. When I bring the MKV file into Handbrake and select the ATV 3 preset the audio settings automatically go to one audio track as a AAC (CoreAudio) Dolby Pro Logic II and a second audio track as AC3 Passthru. If I wanted one of the audio tracks to be a Dolby Digital 5.1 track would I change the AC3 Passthru to AC3 (ffmpeg) for it to be 5.1 surround sound or would I use a different setting?