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Someone got Blu-ray's Dolby Atmos TrueHD sound working on the Apple TV 4K, through quite the hack

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Someone got Blu-ray's Dolby Atmos TrueHD sound working on the Apple TV 4K, through quite the hack

A clever developer has come up with a way to deliver lossless Dolby TrueHD movie soundtracks, complete with Dolby Atmos effects, to home theater speakers from the third-gen Apple TV 4K.

The Apple TV only officially supports Dolby Digital Plus, which is the more compressed Dolby audio codec used by streaming services to reduce the amount of data used, while Dolby TrueHD is used on Blu-rays where bandwidth isn't a problem. So it makes sense for the Apple TV 4K to only use Dolby Digital Plus, since it's a streaming device — but that doesn't stop the enthusiasts from wanting the flexibility of playing files with TrueHD audio on their devices.

The system that Reddit user Agathorpt used to deliver Dolby TrueHD through the Apple TV 4K requires not actually delivering it in TrueHD at all, but converting it to other formats, converting the Dolby Atmos positional data into other formats too, then recombining them in a format that the Apple TV 4K can deliver, but in a higher quality.

As mentioned above, the audio takes a bit of a journey here. The path is:

TrueHD Atmos → decoded audio + timed object metadata → fixed 9.1.6 speaker render → APAC → native tvOS playback.

APAC is Apple's Positional Audio Codec, and while it's not truly lossless (the source audio, TrueHD, is a lossless format but APAC is not) the consensus is that the results here are really impressive.

6-channel speaker configuration, then converts that to Apple's own proprietary spatial audio codec , which can then be played by the Apple TV 4K.


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