Hi Xbox One users!
We've just (magically) turned on direct play support for H.265/HEVC videos in the Xbox One Plex app to gain user feedback and find any issues before fully committing to support in a future update. You will need to restart the app after making sure it's killed by highlighting the app from the Xbox One dashboard, pressing the menu button on your controller and selecting 'Quit'.
Direct Play support comes with a few caveats. The currently only supported container is MP4 and the audio stream codec must be either AAC or AC3. If your video file meets these criteria it should now direct play. We're also interested to know how well the app handles 4K videos. If your video file meets all these criteria and results in an error when trying to play then please send us a sample file that can reproduce the error. Thanks!