My Libreelec is not capable of Dolby Digital Plus DD+ passthrough on Raspberry!

novalis · June 24, 2019 at 10:59 AM

I'd just like to know. Is it possible to get a definite answer to this question? Or is it a secret? So far I don't get it running with my AVR. But maybe I'm doing something wrong.

It works with Windows though.

Light please.

noggin · June 24, 2019 at 11:20 AM

Quote from novalis

I'd just like to know. Is it possible to get a definite answer to this question? Or is it a secret? So far I don't get it running with my AVR. But maybe I'm doing something wrong.

It works with Windows though.

Light please.

Kodi supports DD+ passthrough, so LibreElec support will depend on the hardware support in the surrounding Linux ecosystem that LibreElec uses, which means it's based on the hardware platform you are running.

novalis · June 24, 2019 at 11:54 AM

Oh I didn't mention that, right.

I am using a Raspberry Pi 3.

novalis · June 25, 2019 at 8:24 PM

Quote from noggin

Kodi supports DD+ passthrough, so LibreElec support will depend on the hardware support in the surrounding Linux ecosystem that LibreElec uses, which means it's based on the hardware platform you are running.

noggin any insight?

**Da Flex** · June 26, 2019 at 6:10 PM Official Post

There is no secret setting about pass-through. If your AVR don't receive DD+, then the hardware is too weak.

Loosing an audio track without warning is a bad thing. LE should make it visible to find the weak element of the audio transmission chain. If you're an audio enthusiast, other hardware like the Nvidia Shield TV or the brand new RPi 4B is worth to think about.

trent · June 26, 2019 at 8:04 PM

It works for me. Pi3 running into Yamaha receiver. DD+ passthrough works

novalis · June 26, 2019 at 10:50 PM

Quote from trent

It works for me. Pi3 running into Yamaha receiver. DD+ passthrough works

So if this is not a general issue LE has with the Raspi 3, how can I try to resolve the problem. Because I have no issues whatsoever passing any audio to my AVR. Only DD+ and only on LE Raspi. Kodi on Windows works fine.

I have checked all the Settings I think, so what can I do?

**Da Flex** · June 27, 2019 at 12:19 AM Official Post

The precise version of the RPi and LE might help to find the difference.

It's also possible that DD+ can run different sound quality, which needs more or less system performance.

trent · June 27, 2019 at 12:22 AM

Quote from novalis

So if this is not a general issue LE has with the Raspi 3, how can I try to resolve the problem. Because I have no issues whatsoever passing any audio to my AVR. Only DD+ and only on LE Raspi. Kodi on Windows works fine.

I have checked all the Settings I think, so what can I do?

I will post my settings and signal chain tomorrow. You can compare and then maybe we work from there to determine the problem.

novalis · June 27, 2019 at 10:41 AM

Quote from trent

I will post my settings and signal chain tomorrow. You can compare and then maybe we work from there to determine the problem.

Danke

trent · June 27, 2019 at 4:53 PM

My signal chain is

Raspberry Pi 3 -> Yamaha RXv581 -> LG TV

(I don't go from Pi directly into the TV first because most TVs have passthrough limitations)

LibreElec latest stable (9.0.2 ?)

Kodi > System > Audio settings: (perhaps need to enable expert view)

Code

Audio output device: PI: HDMI
Number channels: 7.1
Output config: optimized
....
PLL adjustment : Off
Allow passthrough: ON
Dolby Digital capable receiver: YES
Dolby Digital Plus capable : YES
DTS capable : YES

In the Kodi "Player" settings, Sync playback to display is OFF.

I am not suggesting that all my settings are correct or right for you. However you should match the settings and signal chain first, so we can determine if DD+ works for you.

novalis · June 27, 2019 at 5:05 PM

All the same for me. Except I have 5.1 channels.

Chain is Kodi LE Raspi 3 - Denon X4000 - Sony TV

Same setup for a Windows PC gives DD+ output. In LE silence with 'Dolby Digital Plus capable' enabled, and Multi Channel PCM with disabled.

trent · June 27, 2019 at 5:29 PM

I will send you a sample to test in a few minutes, please test it. Perhaps send me one of your files which do not play and I will test.

This thread shows a man with same problem.

DD+ stopped working on my AVR since 9.0.0 - Kodi - CoreELEC Forums

As best I can tell, his issue seems to be a combination of two things:

1) files with DD+ encoded in some non-standard way

2) Old version of Kodi handled the non-standard DD+ stream okay. New versions do not

trent · June 27, 2019 at 11:06 PM

Novalis confirmed to me that the sample did not achieve DD+ passthrough when played. (It plays with DD+ passthrough for me)

This rules out the possibility that your video files are at fault.

novalis · June 28, 2019 at 12:32 AM

I use also Netflix. Most of their stuff is also DD+. Doesn't work.

Files are not the issue. They play fine under Windows. Setup is the same.

novalis · June 28, 2019 at 1:01 PM

Here's a log, if anybody is interested

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**sky42** · June 28, 2019 at 2:56 PM

Around 10 diffrent DD+ samples I tested from my library play well on RPi2 and RPi4 from 5.1 up to DD+ 7.1 with Atmos, where my Denon AVR says Dolby Atmos. Tested with 9.2 latest git version.

dersascha · June 28, 2019 at 3:02 PM

Hi guys i am at the lates aplpha on my Raspberry Pi 4 4GB but i notice some screen Tearing when i am in the settings or so. is a known probleme and maybe a fix for it?