[FireInMyHole]

I've reported the audio sync issues as a Kodi bug if anyone would like to add to this thread.

https://forum.kodi.tv/showthread.php?tid=343831

There must be something that can be done within Kodi as MrMC doesn't have the same problem:

Try this A/V sync test video:

https://www98.zippyshare.com/v/5fdVv2pv/file.html

On my setup it's in sync. I'm just wondering if it's something peculiar to the files you're playing. 

This is so incredibly beguiling. This file appears to be in sync, but everything else is out by 300 milliseconds. I'm onto my second stick now, and the outcome is the same.

I've tried every permutation of setting within Kodi and the FireOS but nothing works.

Meanwhile, MrMC plays everything in sync, whether I have it set to match frame rates or not.

Completely at wits end.