I think this is a known bug in Kodi or Amlogic that was introduced with the MAT packer changes. There are some workarounds, check the parent of this linked post:
Hey, running a similar setup (CoreELEC → Q990B → LG CX) and I’ve been noticing the same thing regarding the audio sync on CE 21.1.1 stable. It’s incredibly noticeable with the audio tests from these test pattern videos . They are perfectly in sync when played though the TVs internal player (eARC) and when using my X800M2 (passthrough).
Setting a delay after refresh change (Settings > System > Display > Delay after change of refresh rate) to 2 seconds mitigates the issue but it is still slightly …
Also this thread:
Just posting my experience with this issue. It used to happen quite often when starting a movie (usually with a THD track) it would be out of sync from the beginning, but setting the “Delay after change of refresh rate” option to 2 seconds seemed to improve things a lot for me (not too sure why). I do still notice things going out of sync sometimes after seeking (or pausing/resuming) though.
Workaround by setting refresh rate delay of 2 seconds. Also switch to nightly if you haven’t already.
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