Did you take a look at his findings ? I explicitly said that it is not on streaming services but on purchased files from Apple.
Apple does not provide the audio track in TrueHD. It doesn’t matter whether you downloaded the file or play it on their service.
I am not a beta tester I applied but did not get a response yet, but this intrigues me and I will be following since all of the media on my server is my own discs ripped which contain this audio type, I do not have downloaded media or streamed media on my server or used through my Apple TVs, just my own 2000+ collection movie rips
I understand, that’s why I asked the OP to give us a name of a content which works for him.
I checked on my AVR and went through a bunch of Apple originals and everything is Dolby MAT as it has been before. The OP in Reddit is lying. I’m willing to bet that the picture that was posted was from some other device outputting Dolby TrueHD content.
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My only major concern is I wish Apple would allow pass-through for Atmos from .m2ts files, Or any other file type I guess. So far it’s only with an E-AC-3 mix
Same for me. I’m waiting for his answer on which title he managed to get that.
I had something similar happen to me, sometimes on Apple Music while skipping between atmos songs, my receiver would sometimes show TrueHD playing, however if I fast forward or rewind the song , the receiver would go back to the regular Dolby Atmos, my guess is that it is just a bug in the receiver/Apple TV handshake, I dont think there’s any truehd atmos going on.
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very strange, he answered that on Dune 1 (the one I bought) it works for him. Doesn’t work for me 
It’s clearly a bug. Nothing more to it.
Yeah he confirms that with latest beta it’s back to not TrueHD. But I do agree with him concerning the part saying the audio seems better. It may be placebo, but on Dune part 1, at the beginning you have a big rumbling deep voice, the sound is very open on my side. I should try reverting back to tvOS 17 to compare though
So what are you saying? Don’t update to the new TVOS this fall? What does it break, In the beta anyway?
Now mind you I have a system that “supports” Dolby Atmos and it has never says Dolby Atmos even when I play avatar 2 straight from Apple TV which supposedly has Atmos embedded, or any other Atmos digital copy, so my local Blu-ray/4K rips also just say Dolby surround they never ever say Atmos like they’re supposed to. This could be a problem with the Soundsystem (majority sierra) or an Apple TV software issue…
Do you have Atmos speakers installed?
Nope, just read the previous comments and the reddit post.
In summary, a guy was saying that with one of the tvOS 18 beta, his AVR and TV were reporting Dolby Atmos TrueHD instead of Dolby Digital + Atmos. But he also confirmed that latest beta stopped this behaviour.
I tried to replicate and couldn’t get Dolby TrueHD from Apple TV, only Dolby Digital + Atmos.
Nothing is broken don’t worry.
Concerning your issue, if you have a Dolby Atmos capable system (sierra is a soundbar as I’ve seen ?), you have to plug it to your eARC (or ARC if you only have ARC, Dolby Digital + Atmos will work through ARC, Dolby TrueHD requires eARC but anyway, AppleTV won’t do TrueHD so…) HDMI on your TV and same on your soundbar. On your TV, be sure to enable settings related to ARC and selecting your audio source. You may have a special setting to enable eARC also if your TV is compatible with that.
Then on your Apple TV inside settings you have to enable Dolby Atmos.
After that, on Apple TV + recent movies (such as Dune that we spoke of earlier in this thread) should work with Dolby Atmos. Same for Netflix if you have the 4k subscription 
Also, if you talk about your Bluray rips not reporting Atmos on your soundbar when playing the files with Infuse, that’s normal. If your rips have TrueHD instead of DD+ Atmos, it will be converted to LPCM. If you want to enjoy Atmos with Infuse, you have to have files with DD+ Atmos and not TrueHD. This is the whole point of this thread where we all dream that Apple enables passthrough again on the Apple TV.
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About the pass-through, yeah that’s exactly why I’m here and what I’ve been talking about, that’s the problem I’m having, they need to allow pass through for everything other than e-AC3… They keep gatekeeping
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Also yeah I’ve got all that set everything is the way it’s supposed to be and the outcome is what you said, and I Already knew the result, but thank you for laying it out for me, It’s nice to know that people know what the hell they’re talking about
I can’t see Apple ever supporting straight pass through after all these years.
Sorry to revive this old thread, but is anyone familiar with the “BiTOR” movie releases that are going around? They have a 7.1 DDP Atmos track that has apparently been to be converted from a TrueHD track.
Unfortunately the AppleTV doesnt support 7.1 DDP Atmos, so these still play back as 7.1 PCM. But it seems some progress may have been made on converting TrueHD Atmos to DDP Atmos?
Audio #1
ID : 2
Format : E-AC-3 JOC
Format/Info : Enhanced AC-3 with Joint Object Coding
Commercial name : Dolby Digital Plus with Dolby Atmos
Format profile : Blu-ray Disc
Codec ID : A_EAC3
Duration : 2 h 10 min
Bit rate mode : Constant
Bit rate : 1 536 kb/s
Channel(s) : 8 channels
Channel layout : L R C LFE Ls Rs Tfl Tfr
Sampling rate : 48.0 kHz
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What is the point of these? Plenty of ways to get lossy Atmos. I guess most of its 5.1 Atmos. That’s a lot of trouble to get the rear channels back.