Dolby Atmos no longer processed on iPhone (iOS 14 beta 6)

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Created Aug ’20

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Anyone else notice Dolby Atmos is not being processed on iPhone on the latest beta of iOS 14 (beta 6)?

There is no audible difference between a .m4a stereo down-mix and the .ec3 Atmos file. Everything worked fine and spatial audio via external speakers was achieved using the same files and code on iOS 13.

(Testing on iPhone 11 with 7.1.4 Atmos .ec3 file and encoder down-mix of same file to stereo .m4a.)

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Answer 1

jpdev001 OP

Sep ’20

Tested: If ec3 is added to a video track and wrapped in a .mov, then Atmos gets processed correctly. So it appears iOS 14 has broken audio-only processing of .ac3 and .ec3 audio files.

Expected behavior: .ec3 Atmos/spatial audio can be processed on it's own as audio only (since iOS 13). See: developer.dolby.com/platforms/apple/ios/overview/

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Answer 2

oviano OP

Feb ’21

I am seeing a similar issue on tvOS.

A raw eac3 file containing Atmos only plays as regular dolby using AVAudioPlayer and AudioQueue.

So these samples on the Dolby website are currently broken:

https://github.com/DolbyDev/iOS_Sample_Code

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