Yes, the ROKU is a nice device to have, although I mostly use it for PleX, I am also streaming the 4K NASA UHD feed (at 107w) from the PC to the ROKU 4 using smartdvb. The ROKU 4 supports HEVC h265 2160p@60Hz.
As for NASA TV I stream the url directly to the ROKUs in my house from the PleX IPTV...