There are also USB hubs with integrated LAN ports available very cheaply now - saves you the hassle of buying an additional wifi or ethernet dongle and you probably need a USB hub anyway with the zero if you want to use keyboard, gamepads, USB HDDs/pendrives/... with it.
so long,
Hias
I've pinged admins regarding broken search.
Assuming you are running LE 10.0.3 (you didn't mention which version you use) you could just have looked at the 10.0.3 announcement thread instead of necro-posting to an ancient thread - the solution to your issue is even on the first page of that in post number 15
so long,
Hias
This trick doesn't work anymore! Hot to turn off LEDs now?
use the search function of the forum, this has been asked at least 2 times in the last few weeks....
Provide a full debug log, mediainfo of a recording and ideally a short sample.
The game addons in kodi Nexus added support for that, but I never tried it (also I suck at gaming so there wouldn't be much achievements for me to publish 
Note that retroplayer is currently broken in LE11 nightly builds due to a longstanding bug in kodi which was just fixed a few hours ago https://github.com/xbmc/xbmc/pull/22195
We'll include the fix when kodi releases Nexus RC1 which is planned for end of next week https://github.com/xbmc/xbmc/milestone/151 - so LE11 nightlies in about 1.5-2 weeks should have that feature available.
so long,
Hias
Tried that a while ago by connecting a more powerful charger to the pi, but the result was the same.
Use the official power supply and if you connected bus-powered USB drives remove them or use a powered USB hub. It's really pointless digging futher until you resolved the power issues - would you complain to the mechanics that your car stutters and suddenly stops because you are out of fuel?
so long,
Hias
Post a full log - it could also be some compatibility issue with your USB SSD adapter, power supply issues or anything else
TVs usually don't support 5.1ch PCM - if you connected the RPi to an AVR that'll be different.
If your TV accepts AC3/DTS/... and can decode it or pass it through to an optical output, (E)ARC HDMI port etc then enable passthrough support in audio settings, choose the HDMI device and select available formats (AC3 etc - you need to be in expert level mode to see them)
so long,
Hias
Before you dig further first fix your power supply issues - RPi is reporting undervoltage which is known to cause all sorts of weird issues
RPi throttled=0x50005This should read 0x0
so long,
Hias
LibreELEC-Generic.x86_64-11.0-nightly-20220618-b78941a.img.gz (sha256) worked straight away and is now sitting on an M.2 NVMe.
FYI: that's the oldest nightly we have - latest is down at the end (yeah, we know we should sort it newest->oldest, that's on our TODO list), better use that.
so long,
Hias
LibreELEC is using official Linux kernels and running a custom userland OS (so nothing like Debian, Arch, Fedora etc) and we don't use any window manager at all.
Kodi is in full charge over all graphics stuff and interfacing directly to the graphics drivers (that is, all the stuff your windowing system and window manager would normally do).
This has the benefit that kodi is in full control of everything graphics related and there are no additional layers in between that might decrease performance or hinder doing advanced stuff (like HDR output).
so long,
Hias
It seems ffmpeg is using software decoding which is too much for 4k - please verify if settings->player "Allow using DRM Decoder" and "Allow hardware acceleration with DRM PRIME" are both at the default (enabled) and "PRIME Render Method" is also at default (Direct To Plane)
so long,
Hias
See here https://wiki.libreelec.tv/support/update - simply copy the 10.0.3 to the update share and reboot.
As for the high CPU load - no idea, we need debug "pastekodi" log of 10.0.3, and you also could ssh in and check with "top" and "perf top" what's eating up the CPU resources.
so long,
Hias
I noticed a couple of things:
First of all you are running LE 10.0.2 - please test with the current 10.0.3 release
You seem to have connected the HDMI cable to the wrong HDMI port of the RPi - use HDM0 as HDMI1 has limited capabilities.
You seem to be playing through the emby addon - have you tested with SMB or the file copied to a USB pendrive / HDD?
You didn't enable debug logging and from the looks of it also not adjust refresh rate, together with whitelisting the important modes as described in the wiki. Please to the latter, permanently, and the first when you still have issues after the steps above.
Then upload the logfile either with the log upload function in LE settings or with "pastekodi" via ssh - the logfiles via the SMB share are unfortunately missing important info (guess we should fix that...)
so long,
Hias
Here it is..thanks
Thanks for the log!
As expected RPi is running out of CMA (graphics) memory
Nov 24 23:49:06.029657 LibreELEC kernel: cma: cma_alloc: alloc failed, req-size: 720 pages, ret: -12
Nov 24 23:49:06.030344 LibreELEC kernel: bcm2835-codec bcm2835-codec: dma_alloc_coherent of size 2949120 failed
Nov 24 23:49:43.019743 LibreELEC kernel: [drm:vc4_bo_create] *ERROR* Failed to allocate from CMA:You could try with more memory, add eg dtoverlay=cma,cma-384 (or cma-512) to config.txt to increase it from 256 to 384/512 MB or use another less heavy skin.
There's also a long standing issue that kodi buffers way too many pictures than it actually should and thus is eating graphics memory for breakfast - until that's exhausted and it just crashes. Unfortunately there are no fixes for that yet 
so long,
Hias
Please use the crash upload function in LE settings (or pastecrash via ssh) to provide logs.
Most likely you are running out of (CMA) memory - the necessary info about that is not in kodi logs, but in pastecrash logs.
so long,
Hias
I could reproduce the issue and identified the Y2038 PR https://github.com/LibreELEC/LibreELEC.tv/pull/6727 as the culprit.
I've opened an internal discussion about that but IMO we should just revert that change as it's not fixing any real problems, just causing new ones.
so long,
Hias