I started to watch Disney+ lastnight and realized that my arc was showing stereo pcm and not dolby atmos like it usually does when I watch marvel movies.i started the eternals lastnight and dolby atmos is supported.i thought it was maybe a Disney+ problem but I check on Apple TV and Netflix the same problem.i had my arc for 5 months now it this just happened lastnight.what could the problem be?
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What model TV do you have? Have you checked to see if your audio settings were changed? Is eARC still enabled? Is the Change Format setting on the Apple TV still set to OFF? You might also trying unplugging the TV and Arc from power for a couple of minutes.
I would try a restart of the Apple TV. On ATV go to Settings > System > Restart
If that doesn’t work then a reboot of the Arc and your TV would be my next suggestions to try.
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