I posted this in the other thread, but I’ll post it here just so others can more easily find it.
Is your Apple TV connected to an AV receiver or just a TV?
If connected to just a TV, you may try disabling the Dolby Digital over AirPlay option which can be found in the audio playback settings menu.
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That may help. You could also try setting the Apple TV’s Dolby Digital setting to On instead of Auto.
Essentially what’s happening is that Infsue is trying to pass Dolby Digital to the Apple TV, but the Apple TV is reporting that your TV doesn’t support it.