Xbox and 4k - looking for some clarity

[Volts]

I wonder if it’s related to this issue.

Plex is transcoding full 3840x2160 video to h264 1080p

Transcoding to 1080p if the coded resolution exceeds 2840x2160 is indeed expected behaviour. The video decoder on the Xbox cannot handle resolutions higher than that and will fail to start playing (and previously crashed the decoder and then app). Transcoding to a lower resolution in these situations is unfortunately the only solution, but making sure the content is encoded with a resolution not exceeding 2840x2160 can help you to avoid these transcodes. However if you’re seeing optimized cont…