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Atmos

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hvac:
I have looked. I still don’t see any direct information. Does ATMOS from Dolby add anything to the 7.1 HDMI output from JRiver equipped Computer? I send said output to my Atmos equipped Danon 3800 AV receiver. I see that it receives the 7.1 signal and outputs a new surround sound called ATMOS. Other companies are also competing with their proprietary surround systems.
My question, 7.1 input then something wonderful then even more channels giving a three dimensional sound. Do any of you know how the extra data in the magic box is derived? Online sources including Dolby just say it happens but not how. Audio reviews are not any better in revealing what happens.
My suspicion is that it was not meant to be public knowledge. Or maybe JRiver can help as they don’t have a dog in this fight. Or am I missing something.

slerch666:
Dolby doesn't really want you to know how their secret sauce works.

Like Dolby Vision, my understanding is ATMOS is an enhancement layer laid on top of a TrueHD package.
If you receiver can decode ATMOS, it sees the layer and switches to the object based ATMOS playback; it is layered on top of the TrueHD signal automatically.
If your receive doesn't decode ATMOS, it just plays the standard TrueHD package without enhancements.

No one, as far as I have seen, has transcoded ATMOS into some other 3D format that retains the object based elements.
Any time transcoding is needed, it is performed only on the TrueHD piece with the ATMOS layer being ignored completely. It does not matter the product; they all do this when transcoding.

If you set JRiver MC to bitstream audio, it adds nothing to the mix, does not transcode, and sends the unfiltered, unaltered bits to your receiver to work its magic.

hvac:
Good to know, another question, many streams of music and movies seem to light up the Atmos indicator light on my receiver. They can’t all have been imbued with the secret sauce, can they. Or are they really playing to my machine with newly added data at the source?
I don’t know how to be politically correct with this question, does JRiver have any reason to avoid this question? Or to avoid looking deeper for an answer? That question alone might involve proprietary information. I come to JRiver because of the balance and advanced understanding of any other issues.

slerch666:

--- Quote from: hvac on June 06, 2024, 10:44:18 am ---Good to know, another question, many streams of music and movies seem to light up the Atmos indicator light on my receiver. They can’t all have been imbued with the secret sauce, can they. Or are they really playing to my machine with newly added data at the source?
I don’t know how to be politically correct with this question, does JRiver have any reason to avoid this question? Or to avoid looking deeper for an answer? That question alone might involve proprietary information. I come to JRiver because of the balance and advanced understanding of any other issues.

--- End quote ---
Are you using MC w/ music when the ATMOS light comes on? If you've ripped from a BD an ATMOS track with the ATMOS layer intact and are doing bitstreaming, that would make sense. Or if you have found a way to "permanently borrow" a rip of an Apple Music ATMOS encoded track, that would explain it as well.

MC cannot and will not magically encode anything into ATMOS.

If you are using Apple Music ATMOS spatial music may work on your receiver if the Apple streams are ATMOS enabled. I don't have an Apple TV and don't use Apple Music so I can't do anything other than speculate.

Amazon supports ATMOS as well but not to receivers (that I am aware). Only works to their devices and I think SONOS.

On my Marantz receiver, I can enable faux ATMOS with the receiver from any source. It will "upmix" at the receiver level if I let it. I don't let it.
If something supports ATMOS my receiver will switch it from Stereo to ATMOS automatically then remembers to go back to stereo on non-ATMOS sources.


If you have a UHD or BD rip, or are watching a BD/UHD that has ATMOS, you enable bitstreaming and it sends ATMOS to your receiver.

MC won't add data to your sources and will only send ATMOS via bitstreaming if you enable bitstreaming AND the audio has ATMOS encoded into it. Otherwise you get TrueHD to PCM if you transcode (or DSD I guess if you choose to transcode to that).


I don't think JR have any reason to avoid the question.

DocCharky:
Your question seems to imply that there’s a hidden conspiracy surrounding Dolby Atmos, but that’s not the case.

A large number of high-budget TV shows and films are now mixed with Dolby Atmos. If you bitstream your media with MC to a device that’s compatible with Atmos and it responds, then your media does indeed have an Atmos track.

The perceptible difference and your ability to hear it will largely depend on the mix (some are subtle, others are not) and your setup (speakers that simulate Atmos by bouncing sound off the ceiling are almost placebo. The only authentic way to experience Atmos sound is to have speakers positioned above the main listening position).

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