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Emby is transcoding Dolby TrueHD Atmos to DD+


fasmit
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fasmit

Hi,

This app seems to have the same problem as here for the Android app:

 

"TrueHD Atmos file -> Emby server -> lan -> LG C9 -> Emby TV app -> eArc HDMI -> Marantz SR5015 -> displays DD+ and not "Atmos" on info

Yet it CAN work because (all the same with Plex):

Same TrueHD file -> Plex server -> lan -> LG C9 -> Plex TV app -> eARC -> AVR -> DOES display "Atmos" on info

So it appears that Emby transcodes the TrueHD audio to DD+ while Plex does not and then everything passes it through unmodified correctly? Or maybe Plex does some transcoding to EAC3 or so? As EAC3 sources work fine on both.

Then when disabling audio transcoding on the user level for Emby I get no sound at all.

What I might try next is connect the LG's optical out to the AVR and not use eARc?"

 

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rbjtech

Does the Media file have other Audio tracks other than TrueHD ?

Remember there are two 'levels' of Atmos - Tru-HD Atmos and eARC (DD+) Atmos.  Both will show as 'Atmos' on your AVR but they are not the same - one is lossless, one is not.

As far as I am aware, no app has managed to pass Thu-HD out the LG C9 - Infact from memory, I don't think this is even technically possible as the 'hardware' is missing.  It can though pass EAC3/DD+ (with Atmos).

So, going back to my original question - if your source has an EAC3/Atmos track - they will play as Atmos on your AVR, Tru-HD will not - and I suspect Plex is aware of this, and is simply playing the EAC3 track instead.  Looking at your AVR 'input' by using the AVR remote Info button will show you the full details (if it's anything like my Denon, which I believe Marantz are..)

The only way to get Tru-HD/Atmos passed to your AVR is to go direct with the likes of an Nvidia Shield.  ie Emby Server > Lan > Shield > AVR > LG C9 - no need for eARC or ARC - you are directly passing video/audio into the AVR, Video (only) is then passed onto the TV.

Edited by rbjtech
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fasmit
13 hours ago, rbjtech said:

Does the Media file have other Audio tracks other than TrueHD ?

Remember there are two 'levels' of Atmos - Tru-HD Atmos and eARC (DD+) Atmos.  Both will show as 'Atmos' on your AVR but they are not the same - one is lossless, one is not.

As far as I am aware, no app has managed to pass Thu-HD out the LG C9 - Infact from memory, I don't think this is even technically possible as the 'hardware' is missing.  It can though pass EAC3/DD+ (with Atmos).

So, going back to my original question - if your source has an EAC3/Atmos track - they will play as Atmos on your AVR, Tru-HD will not - and I suspect Plex is aware of this, and is simply playing the EAC3 track instead.  Looking at your AVR 'input' by using the AVR remote Info button will show you the full details (if it's anything like my Denon, which I believe Marantz are..)

The only way to get Tru-HD/Atmos passed to your AVR is to go direct with the likes of an Nvidia Shield.  ie Emby Server > Lan > Shield > AVR > LG C9 - no need for eARC or ARC - you are directly passing video/audio into the AVR, Video (only) is then passed onto the TV.

Thanks! It has a DTS-HD MA track too; however, choosing this explicitly in Emby (or Plex) makes the receiver just display "DTS". Not sure what Plex is doing then ...

But found this post and that's indeed exactly the problem. Problem with having the AVR display the info by the way is that the TV is taking over the video, so it doesn't show the HDMI input from the AVR; hence, can only look at the little display on the receiver itself.

 

So no joy on LG it seems :(

 

Quite annoying, so I'll probably have to buy a 200 eur nvidia shield pro (or just a full PC, not sure yet, bit worried the shield again will have problems with apps and limitations and so on: not much beats good old VLC on a PC...) and the LG remote is so damn nice... But yeah, not going to send poorer quality audio to a 5k eur speaker setup either.

Edited by fasmit
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rbjtech
1 hour ago, fasmit said:

Problem with having the AVR display the info by the way is that the TV is taking over the video, so it doesn't show the HDMI input from the AVR; hence, can only look at the little display on the receiver itself.

You are correct, my mistake, it's been a while since I used the LG App as I myself moved on from the limitations of my LG TV ARC connection (to get True-HD and DTS-HD) and over to a Shield Pro.

You can only get the 'full' onscreen source/speakers detail when you connect the TV to the 'Monitor Out' on the AVR - ie you are passing both Audio AND Video through the AVR.  This will be available to you if/when you get the Shield - or any other input device for that matter.  It's pretty cool as you can see the source, channels, speakers those channels are using etc etc.

ps - the Shield plays EVERYTHING I have thrown at it - Incl Profile 7 (UHD Spec) Dolby Vision - It is without doubt, THE Emby Client to get if you want to play UHD Remux's in all their glory and has the bonus of being about to Direct Mount the storage, so it direct plays it at a FILE level - like Kodi and VLC do...  ;)

All the best.

Edited by rbjtech
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fasmit
2 hours ago, rbjtech said:

You are correct, my mistake, it's been a while since I used the LG App as I myself moved on from the limitations of my LG TV ARC connection (to get True-HD and DTS-HD) and over to a Shield Pro.

You can only get the 'full' onscreen source/speakers detail when you connect the TV to the 'Monitor Out' on the AVR - ie you are passing both Audio AND Video through the AVR.  This will be available to you if/when you get the Shield - or any other input device for that matter.  It's pretty cool as you can see the source, channels, speakers those channels are using etc etc.

ps - the Shield plays EVERYTHING I have thrown at it - Incl Profile 7 (UHD Spec) Dolby Vision - It is without doubt, THE Emby Client to get if you want to play UHD Remux's in all their glory and has the bonus of being about to Direct Mount the storage, so it direct plays it at a FILE level - like Kodi and VLC do...  ;)

All the best.

Thanks! :) I ordered the shield pro this morning; will be delivered tomorrow. sounds very promising!

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