That is my setup too (one HDMI is TV, the other is soundbar)
-Are playing DTS or Dolby audio? Make sure you have passthrough active.
-On your soundbar you might need to change to a differnet output to get sound. Mine defeaults to 'TV' but audio is coming out through the other HDMI.
The common RPi 4 setup is HDMI-0 for video, and HDMI-1 for audio. So maybe just switching the ports will do.
You can't do HDMI settings at config.txt since LE 10. I don't think those settings could fix the issue, anyway.
Something is fishy with your soundbar. Maybe a driver issue.
Ok, I have activate the debug log and here is the log:
Here is the Audio devices:
No hdmi-1 devices.
Thank you.
Regards
lnix
There is no HDMI-1 device at the log, too. I can't find a Nubert A250 online. Does it only have one HDMI-ARC port?
PS: Does modetest list your soundbar?
Modetest shows the second HDMI is unconnected:
40 0 disconnected HDMI-A-2 0x0 0 39If your soundbar only has an HDMI-ARC port then most likely you must connect it to an ARC capable port on your TV, connecting it to an HDMI port of the RPi probably won't work - check the documentation of your soundbar.
so long,
Hias
If RPi -> TV -> Soundbar cabling is impossible, think about getting an HDMI audio extractor or a HiFiBerry Digi+. Both can be connected to you soundbar via TOSLink. If you chose HiFiBerry, then you eventually need a new RPi case, too.
Then I would chose the HiFiBerry solution. So you can switch RPi audio output (HDMI or HiFiBerry TOSLink) by using a Kodi app on your smartphone / tablet. HDMI for video, and HiFiBerry TOSLink for audio.
ok thank you. I will buy me a HiFiBerry 
Hi Inix,
before you spend some Money on a HiFiBerry I suggest you should try the following:
1. Your Nubert Speaker have an ARC-HDMI Port.
On Page 9 in the German Manual to your Speakers it says that CEC and HDMI ARC on your TV must be enabled to made the HDMI-Port of the speakers work.
The Raspberry didn't have an HDMI-ARC Port, but did you enable the CEC-Funktion in LibreELEC/Kodi ?
I don't use CEC but as far as I know you can find the Setttings under "System" -> "Input" -> "Peripherals"
2. Did you use the right HDMI-Cable ?
Don't use any Adaptor from Micro-HDMI to HDMI - Use a cable like this (from your screenshot I assume that you are from Germany or another German speaking County, so this is a Link to a German Webpage)
I know you did this before, but please try again:
3. Connect the HDMI-Port right beside the USB-(Power)-Port (HDMI 0?) to your TV
4. Connect the other HDMI-Port (HDMI 1?) to your Nubert Speakers.
5. This is very important:
a) First turn on your Nubert-Speakers
b) Than turn on your Raspberry Pi4
c) And at last turn on your TV
6. Now check if you can select your Speakers in LibreELEC/Kodi
7. If you can't get a Picture on your TV or can't select your Speakers turn off the Raspberry, the TV and the Speakers
8. Switch the HDMI-Cables - The Port beside the USB-(Power)-Port to your Nubert-Speakers and the other one to the TV.
9. Now go back to Point 5 & 6 above
10. If this doesn't work either why not try an older Version (9.2.8) of LibreElec ?`
Yon can find the Download here:
LibreELEC Raspberry - LibreELEC
11. If this doesn't work too you can still buy a HiFiBerry
Oh, and by the way:
The Nubert "nuBox" A-125 is no "Soundbar".
It's only a pair of Stereo-Speakers with an HDMI-Input.
Look here (sorry it's in German)
Aktivlautsprecher nuBox A-125 von Nubert
They only work with a "PCM" Stereo Signal (Highest level is 24 bit / 192 kHz)
(You can read about that in the Manual)
They can't handle things like Dolby Digital, Dolby True HD DTS or Atmos.
So in the Kodi "Audio Settings" you have to disable "Passthrough" and set "Number of Channels" to "2"
They only work with a "PCM" Stereo Signal (Highest level is 24 bit / 192 kHz)
(You can read about that in the Manual)
They can't handle things like Dolby Digital, Dolby True HD DTS or Atmos.
So in the Kodi "Audio Settings" you have to disable "Passthrough" and set "Number of Channels" to "2"
Thanks for the info. That's the same sampling rate like the HiFiBerry Digi+. It means, lnix doesn't have to switch among HDMI and TOSLink, because HDMI transmission has no benefit for the speakers. He wants to hear music with TV switched off, so I think the HiFiBerry isn't a bad idea.
