Conversion failed. The transcoder exited due to an error (Memory Allocation failures)

Someone pointed you to another thread already here: Optimizing 4k titles causes Plex to freeze - TrueHD audio the problem?

That may not be the same issue as what’s reported in this thread, but I would appreciate if someone from Plex took a look. It’s quite an annoying issue for me right now and it really does seem to be a TrueHD audio problem.