Since tvOS 18 update Apple TV 4K and Apple TV HD output only stereo despite 5.1 selected

The stereo output exists for premium streaming apps (Max, Prime Video, Paramount+). It appears that only Home Sharing still plays 5.1 audio. Audio output for both Apple TVs has always been set to Format Change On, Dolby Digital 5.1, but setting to Auto doesn't provide a remedy. A week ago (before the update), all programs for which 5.1 was available played 5.1 output. Have tried force-quitting apps, restarting Apple TVs, deleting and reinstalling apps. No difference. Any idea when this will be fixed, Apple?

Apple TV 4K (3rd generation)

Posted on Sep 22, 2024 12:59 AM

Top-ranking reply

oviano

Level 1

46 points

Posted on Oct 1, 2024 4:40 AM

As a developer I have found that the SDK API function AudioConverterFillComplexBuffer has stopped working for EAC3 in tvOS 18. This means it is not decoding EAC3 streams that use this API. The same function worked correctly on tvOS 17, and continues to work correctly on macOS.

Perhaps this is related, perhaps it isn't.

I've reported this via the developer Feedback Assistant.

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36 replies

Beto F

Level 1

8 points

Oct 14, 2024 7:13 PM in response to llee

Here, in Rio, Brazil

I have the same problem with my Apple TV FHD MODEL A1625after the update to tvIS 18.0 . My Pioneer Receiver show me only Stereo with my videos and shows from iTunes with 5.1 audio. Maybe after a new update…who knows?

llee Author

Level 2

273 points

Sep 25, 2024 4:47 PM in response to llee

That entire comment was a little too long to be allowed in the comment field at Apple TV Feedback, so I removed the last sentence.

Sep 28, 2024 4:39 PM in response to llee

My guess is that re-encoding from Dolby atmos to dts 5.1 is broken in tvos18 since streaming of original dts 5.1 is still working

Windh

Level 1

98 points

Sep 28, 2024 4:46 PM in response to clemensfromewijk

No surround works whatsoever in my case. Not Atmos nor dts.

p-cross

Level 1

4 points

Sep 28, 2024 11:36 PM in response to llee

Checked everything and it’s the TV iOS 18 update. With millions of boxes apples c needs a hot fix for this one.

Slow horses with sub titles is not the same

Mannu37

Level 1

8 points

Oct 1, 2024 6:17 AM in response to llee

No surround sound working with Apple TVos HD and 4k. Its been two weeks now and annoying to wait. Please support with another update, apple. Thank you.

Since tvOS 18 update Apple TV 4K and Apple TV HD output only stereo despite 5.1 selected