4K HEVC on 1080P Roku

[wenzelja]

Playing a 4K HEVC SDR FILE on 1080P Roku

I’m having troubles playing this file on my Roku. I’ve enabled hardware transcoding using Intel QSV and HEVC checked in options, but the movie only plays a few seconds at a time then pauses, loads, plays, then pauses repeatedly. How can I get this to play smoothly. What settings in the Roku player can I use to help this along? There are a few settings in the Roku Jellyfin app for HEVC decoding, just not sure what to select/unselect.

Movie plays fine on my iPhone 14 after an initial loading delay, but doesn’t pause unless I hit the pause button. I’m using Streamyfin and Swiftfin as my apps for testing, but planning to go strictly with Streamyfin when rolling out for public (I.e. my wife) use.

I haven’t tried anything else client-wise, though I do have a 4k TCL Roku TV I can try.

Server is Windows 11 running on 12Gen Core i7 w/ 16GB RAM and UHD770 graphics. Roku is a Premiere+ and TV is a 1080p Samsung.

P.S. the movie is a straight mux (no edits, transcodes, etc.) from a 4K Blu-ray ISO file.

[TheDreadPirate]

Can you share your logs via pastebin? Is it possible the connection speed isn't fast enough? 4K remuxes need 75+Mbps. Usually more since Jellyfin needs to buffer.

[wenzelja]

My router is an AC2400 and my isp is 300 up/down.

[rezseeker]

I had the same buffering issue with 4k footage and a Roku Premiere 4k stick. Couldn't for the life of me find a fix in various Jellyfin settings though I have plenty of bandwidth.
I also have a Google Chromecast with Google TV 4k. The Google device has no problem at all with any of my 4k content.