Correct, HDMI options have been moved to cmdline.txt, using a different syntax. You don't need the "force hotplug" option anymore. Just add the preferred HDMI mode to the end of the line (only separated by a space sign). Example:
video=HDMI-A-1:1920x1080@60DIn cmdline.txt :-
boot=UUID=1507-5354 disk=UUID=077f401e-ddf6-42b9-95f9-dfb3c6c109f1 quiet
video=HDMI-A-1:1920x1080M@60
No. The HDMI mode has to be appended at the same line, just separated by a space sign.
Thanks for your reply, but the solution is to a PC that runs Windows. I use Libreelec on my PC.. Is there a similar solution as that one you think?
Did you read the right post at the link? it's post #4.
Curl works on Linux. Which OS do you want to use to control LE?
OK, then I think the missing data formats (post #14) are the issue. I already had an internal team discussion about this. Unfortunately nobody has the skills to fix it. So you can only wait for updates. 
The log snippet looks OK to me. Only 2 channels are used for PCM, even if you have 8 audio output channels enabled in the settings.
Read here about the difference between passthrough and non-passthrough: Click!
Try passthrough with only 2 audio output channels. As mentioned, multiple channels will be encoded into 2 (FL, FR), so you'll get all 6 DTS channels with only 2 audio output channels in the settings.
Can you please test with disabled hardware decoding anyway? It could also be a driver issue, not the hardware itself.
Thanks. I'll send the feedback back to the dev.
A dev has replied to me. FFMPEG is capable to play the VP9 codec, but probably not the accelerated chip. Turn off hardware decoding.
I need to try the LE 12 nightly and see if it resolves the issue.
If not, share a log from the nightly...
In both cases used format is AE_FMT_S16NE, present on both platforms. What about frames, which is diffrent? Is there a way to change them?
If connection breaks on a higher frame rate (only audio in your case), then it's sometimes bad HDMI cabling.
I would check whether your HDMI cable(s) is/are conform to HDMI 2.0 or 2.1. Those cables have better shielding, so they can handle higher data rates (4K video, HD audio etc.).
Thanks. LE and OSMC receive different capabilities from the AVR.
OSMC on RPi (working):
2023-08-19 14:49:22.757 T:669 info <general>: Device 4
2023-08-19 14:49:22.757 T:669 info <general>: m_deviceName : hdmi:CARD=vc4hdmi,DEV=0
2023-08-19 14:49:22.757 T:669 info <general>: m_displayName : vc4-hdmi (vc4hdmi)
2023-08-19 14:49:22.757 T:669 info <general>: m_displayNameExtra: GSM LG TV on HDMI
2023-08-19 14:49:22.757 T:669 info <general>: m_deviceType : AE_DEVTYPE_HDMI
2023-08-19 14:49:22.757 T:669 info <general>: m_channels : FL, FR
2023-08-19 14:49:22.757 T:669 info <general>: m_sampleRates : 32000,44100,48000,96000,192000
2023-08-19 14:49:22.757 T:669 info <general>: m_dataFormats : AE_FMT_RAW,AE_FMT_S24NE3,AE_FMT_S24NE4,AE_FMT_S32NE,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_S16BE,AE_FMT_U8,AE_FMT_RAW
2023-08-19 14:49:22.757 T:669 info <general>: m_streamTypes : STREAM_TYPE_AC3,STREAM_TYPE_DTSHD,STREAM_TYPE_DTSHD_MA,STREAM_TYPE_DTSHD_CORE,STREAM_TYPE_DTS_1024,STREAM_TYPE_DTS_2048,STREAM_TYPE_DTS_512,STREAM_TYPE_EAC3,STREAM_TYPE_TRUEHDLE on Odroid C2 (not working):
2023-08-16 17:39:00.077 T:807 info <general>: Device 3
2023-08-16 17:39:00.077 T:807 info <general>: m_deviceName : hdmi:CARD=ODROIDC2,DEV=0
2023-08-16 17:39:00.077 T:807 info <general>: m_displayName : ODROID-C2
2023-08-16 17:39:00.077 T:807 info <general>: m_displayNameExtra: HDMI
2023-08-16 17:39:00.077 T:807 info <general>: m_deviceType : AE_DEVTYPE_HDMI
2023-08-16 17:39:00.077 T:807 info <general>: m_channels : FL, FR
2023-08-16 17:39:00.077 T:807 info <general>: m_sampleRates : 8000,11025,16000,22050,32000,44100,48000,64000,88200,96000,176400,192000
2023-08-16 17:39:00.077 T:807 info <general>: m_dataFormats : AE_FMT_S24NE4,AE_FMT_S16NE,AE_FMT_S16LE,AE_FMT_RAW
2023-08-16 17:39:00.077 T:807 info <general>: m_streamTypes : STREAM_TYPE_AC3,STREAM_TYPE_DTSHD,STREAM_TYPE_DTSHD_MA,STREAM_TYPE_DTSHD_CORE,STREAM_TYPE_DTS_1024,STREAM_TYPE_DTS_2048,STREAM_TYPE_DTS_512,STREAM_TYPE_EAC3,STREAM_TYPE_TRUEHDDifferences are at "dataFormats" section. Missing data formats on LE:
I guess you found an LE bug. Wait for chewitt now.
Understand, the reason i asked for help is some of the add-ons impacted would appear to be popular for example uTube and OpenVPN ( to use with NordVPN)
Use our search function (magnifier icon) with "YouTube" or "VPN" as keywords.
Pro tip: Start your search from the forums main page to search in all sub-forums.
I've tested a Behringer UMC22 on my RPi, and it works fine. The output is studio quality, if connected to active studio monitors.
Python version is compiled into LE. So you can't change the Python version on LE. You can only downgrade LE.
If you're disappointed with the situation, ask the add-on developer to compile with a newer Python.
Why "channel count" is 2?
Try two output channels on LE's audio settings. As mentioned, the six DTS channels (see log) will be encoded into those two.
Sound system configuration is fine, because it worked well with Raspberry Pi + OSMC (well, there were another things that not worked).
Do you have another microSD for LE on RPi? Then we could compare both logs.
Multiple audio channels can be encoded into two channels, so don't care about it.
Looks like LE doesn't support audio passthrough on your device:
2023-08-16 17:39:00.072 T:807 debug <general>: PulseAudio: Context authorizing
2023-08-16 17:39:00.073 T:807 debug <general>: PulseAudio: Context setting name
2023-08-16 17:39:00.074 T:807 debug <general>: PulseAudio: Context ready
2023-08-16 17:39:00.074 T:807 warning <general>: Pulseaudio module module-allow-passthrough not loaded - opening PT devices might fail