Playing videos with Stereo MP3 has no Audio in tvOS 15 beta

[FordGuy61]

Also happening with other audio formats. There are multiple threads on the topic. iPhones/iPads are exhibiting similar issues with iOS 15 beta. Second thread below mentions a possible workaround, forcing a transcode.

No audio from Apple TV 4K and iPhone 12 PM (tvOS/iOS 15 beta)

We’ll make sure everything is working by the time iOS/tvOS 15 is publicly released, but this is only developer beta 1, and not even a public beta of the OS yet, so please be patient and bear with us

[BUG] No Audio on Certain File Types with tvOS 15 (beta) and Plex AppleTV (beta)

I found a quick fix for any video where the audio doesn’t play for this bug is to swipe down, go to Playback Settings and select ‘Convert Automatically’ instead of ‘Play Original Quality’ and sound pops in.