I'm finding that almost every movie or TV show on iTunes plays in stereo as opposed to 5.1 audio on my Apple TV 4. I know 5.1 audio works since Netflix and HBOGo both play 5.1 audio and I managed to find one movie in iTunes (Guardians of the Galaxy) that plays 7.1 audio. Every other movie I've tried plays stereo (my receiver reports PCM). These aren't no name films either. I tried Star Wars The Force Unleashed, Zootopia, Jurassic World and Avengers. All those movies only have one audio track, which is stereo. I've tried changing the audio out setting from best quality to Dolby digital, but that just changes the output for from multiple channel PCM to Dolby for things that already output 5.1. I did notice that playing the preview for a movie from search plays in 5.1 audio, but opening it in iTunes and playing the preview there plays stereo. Something is definitely wrong. Do most iTunes movies just lack 5.1 audio? That can't be correct can it? Edit: I found someone having the same exact problem who posted on the Apple forums today. I wonder if this is an iTunes issue. Movies App Won't Properly Play 5.1 Surround Sou... | Official Apple Support Communities It's odd since all previews play 5.1 through search, but most do not in the movies app. As such I would expect playing movies in the TV app to output 5.1 audio, but they output stereo. Here's movies I've tested: 1. Avengers - stereo 2. Zootopia - stereo 3. Guardians of the Galaxy - 7.1 audio 4. Jaws - stereo 5. Jurassic World - stereo 6. Star Wars The Force Awakens - stereo 7. Wreck-it Ralph - 7.1 audio 8. Captain America Civil War - stereo Anyone else having problems?