OK, so since the Direct Play setting has been removed (somehow) from the Settings section in Plex on the Shield, I can no longer play my homevideo content in 4k (made in iMovie).
Plex now tries to transcode the content, but the transcoder seems to crash or samething cause after pressing play the spinner will load forever and eventually say the content can't be played. Also trying to let Plex 'Create optimized version' won't work: the conversion will get stuck at 1%.
I used to work around this by enabling the Direct Play option in Settings, but that is GONE (sigh...).
I have read somewhere that creating a custom profile xml file for the Shield would help, and enabling/forcing the directplay option in there, but if I am correct running PMS on a Shield won't let us anywhere near those files when the Shield is not rooted.
In short... I am stuck with many, many homevideos in 4k, which ONLY playback fine in a webbrowser with Plex, but they won't play on iOS, chromecast or the Shield player itself. Any fix?