Device for media playback

[barmyllama]

It’s connected to the TV then eARC to the AVR/Soundbar….

Thanks.

I was hoping you'd say the opposite and I could give Apple TV a try instead of my Nvidia Shield. That's only a £170 outlay to see if it solves my audio sync problem.

Swapping my AVR, for one that has eARC would be significantly more expensive.

To be honest, I'm 99% sure it's the Exoplayer that Plex uses. Jellyfin also uses it by default, but you can use external players with Jellyfin and I've found one that works with audio sync issues.