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How does Atmos show up under Codec Information? Is my media Atmos?


stevedawg85

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stevedawg85

Does "TruedHD" = "Dolby Atmos"?

This is fromEmby when viewing more info on my Mad Max:

http://imgur.com/a/wt2ll

 

Will I experience the full Atmos effect?  

Can I assume all Atmos movies will show up as "TrueHD"?

...If so, Is there a such thing as normal TrueHD w/o Atmos?

 

(I plan on watching this in Kodi w/ Audio passthrough.  In Kodi, it also displays the TruHD logo where I was expecting an Atmos logo)

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Jdiesel

I could be wrong but I believe the Atmos track are packaged the same way as TrueHD tracks so there is very little difference between the two. I don't believe that the media info probe is smart enough to distinguish the difference between a regular TrueHD track and an Atmos TrueHD track. What matters is what shows up on your AVR, if it shows Atmos you are good to go.

 

I recall some skins in Kodi are able to use naming conventions to parse out Atmos from the file name and apply the correct codec tag but I am guessing that this may not work when using Emby with Kodi.

 

https://emby.media/community/index.php?/topic/12411-dolby-atmos-media-info/?hl=atmos&do=findComment&comment=375748

Edited by Jdiesel
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That's what ffprobe tells us right now, just TrueHD. I imagine at some point they will add differentiation if there is a need for it.

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Waldonnis

I could be wrong but I believe the Atmos track are packaged the same way as TrueHD tracks so there is very little difference between the two. I don't believe that the media info probe is smart enough to distinguish the difference between a regular TrueHD track and an Atmos TrueHD track. What matters is what shows up on your AVR, if it shows Atmos you are good to go.

 

This is correct.  There are ways to detect whether a TrueHD stream has an Atmos metadata substream, but I don't think ffprobe/ffmpeg currently know the difference.  Atmos (the home theatre version) is really just an extension to TrueHD/EAC3 (can't have Atmos without TrueHD or EAC3, but the inverse is possible), so it probably doesn't really matter as long as the AVR or playback device can decode it or pass it through intact to something that can.  If the AVR/device can't decode the Atmos data, but can decode EAC3 and TrueHD (like mine), then it should just ignore the Atmos bits.  If it can but it's not detecting it properly, that will require more info for troubleshooting (playback platform, AVR model, how it's all connected, etc).

 

I like to know which of my files have Atmos streams, so I just note Atmos streams in the stream name metadata.  It's really quite neat how Atmos is encoded for home theatre use (spatial mix rather than discrete channels, allowing for flexible/expandable speaker setups).  Worth looking at some of the info on Dolby Labs' site if you are interested in how it works.

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Guest asrequested

Atmos and dts-x are object based, TrueHD and the others are legacy. As above mentioned, Atmos is an 'extension' of TrueHD. Even though the UI says TrueHD, as long as you're bitstreaming and your AVR supports Atmos, you will experience Atmos. And you also need to use Theater desktop.

Edited by Doofus
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  • 2 years later...
vdatanet

I can tell you roughly that there are two versions of ATMOS:

 

1. TrueHD + Metadata (used in Bluray discs)

2. DD+ + Metadada (used in streaming servicies, you may find it in bluray rips because there is software converting TrueHD Atmos to DD+ Atmos, but it's not common)

 

ATMOS is not a sound codec, it's a codec + metadata. So we have to say TrueHD ATMOS (lossless) or EAC3 ATMOS (compressed)

 

So OP affirmation TrueHD = ATMOS is false.

Edited by vdatanet
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