Some of my videos when I play them via Apple TV (2 different ones) start with no sound. I have to swipe down and change the Playback setting from English (EAC 5.1) to English (AAC Stereo) and then the sound works.
I don’t have a 5.1 setup, so this isn’t surprising, but I cannot find where the default setting comes from as it’s not consistent. Some videos work, others don’t, but why is it defaulting to 5.1?