Yesterday, 02:45 AM
Just got a Roku Ultra and I can confirm the same behavior. After setting up with 5 width and height in the trickplay settings I can only see the thumbnails when a video is being transcoded. My whole library is HEVC so I can just "Disable HEVC" in Jellyfin on the Roku to force transcoding of all content, but that seems like a step in the wrong direction. Really wish this worked for direct play.