I initially tried it with ac3 audio unfortunately there was a lot of noise in the stream when I played it back with the hdhomerun windows 10 app. Switching to aac audio seemed to clean this up. I am not sure what is the default audio format for h265 video on hdhomerun. I am on fios and do not receive any h265 channels. Fios is very behind the times. They don’t even support ipv6. However both h264 and mpeg2 use ac3 audio.