2013-12-14, 07:55 PM
For US ATSC digital TV broadcast, as Martin points out all sound is Dolby AC3 encoded. Your HVR-2250 card simply tunes the signal and passes the multiplexed audio/video MPEG-2 data through to the system. No AAC codecs in that case. AC3 is proprietary and so you have to jump through a few hoops to get it working, but you'll get it.