AirPlay with 4th gen

Is anyone able to get AirPlay to work with a gen4? It’s inconsistent if any recordings show the AirPlay button and even if they do, the video doesn’t play. I see “bufferAddCodecError -12927” in the logs on my LG OLED55BXPUA. I was hoping to use AirPlay until the WebOS app is released.

What video formats does apple airplay support.