Any way to play 4K IPTV stream on Roku TV?

[flashls82 4]

I've been fiddling around with IPTV in exploring that as a longer-term solution for some stuff. It works pretty well straight out of the box on my Roku TV (i.e. just with a filtered m3u) with all except the handful of 4K channels, which always get into a transcoding loop that eventually fails. 720p/1080p channels seem to transcode as well, but they work fine. This is from a TS source coming from the IPTV provider, everything running on a UGREEN NAS via Docker with Intel QuickSync hardware acceleration working fine. Also tried running it through Threadfin/setting up as an HDHomerun tuner to see if that'd help, but had the same problem. These same 4K channels play fine on my laptop and on my iPhone/iPad, so this is purely something about getting the format the Roku TV will play.

I am guessing the problem here is that Roku TV wants 4K stuff in an H265 container, for whatever reason it can't handle the original TS file, Emby wants to put it into an H264 container, and it never works. 

But... has anyone had any success playing 4K IPTV files on the Roku app? Any ideas for things to try (e.g. in any processing I could have Threadfin do pre-Emby)? This isn't a huge deal but mildly annoying. 

Edited 2 hours ago by flashls82
Edit to clairfy that these streams work on other devices