Also, according to Google, the PiPO X7 has a very low power Atom CPU from 2014 (Atom Z3736F) - probably very inadequate for 4K decoding from h.264 format, and a lot of 4K content uses h.265 which would need some hardware acceleration in the CPU (not present in this old Atom). I would also recommend a much newer device if you are serious about playing 4k content.
https://ark.intel.com/content/www/us…o-2-16-ghz.html
Direct streaming requires CPU power too? Sorry I am new to this
(My 4k UHD movies are mostly h.264)