4k needs to be in MP4 container for Plex to not transcode it.
https://forums.plex.tv/t/really-nee...rom-my-pc-to-plex-app-via-roku-stick/220500/4
https://forums.plex.tv/t/streaming-...y-plex-server-to-atv-4k-plex-client/208486/17
https://forums.plex.tv/t/really-nee...rom-my-pc-to-plex-app-via-roku-stick/220500/4
https://forums.plex.tv/t/streaming-...y-plex-server-to-atv-4k-plex-client/208486/17