4K 10@L5@Main video stutters/jams on intel 8th gen graphics

Hello,

I have a small HTPC made of (almost) all-in-one motherboard with N3150 quad core celoron with integrated 8th gen intel graphics. The OS behind is the latest version of LIbreElec of course. I`ve got the system for about 5 years and so far all the media formats (full HD, differennt audio formats etc) played without any issues, however now I tried the 4K video coded at HEVC (profile = 10@L5@Main) and the video is jamming/slowing down every second. On the Intel`s support page I read that H.265/HEVC @ level 5 (GPU accelerated) is supported so if I`m reading it correctly also the content I was trying to play shall be decoded. Have you had similar issues? What is the solution?

I`going to post here the log/info from the HTPC itself but later on - unfortunately I`m unable to do it now.

Thank you in advance

Thanks for the prompt reply, please see the log at http://ix.io/2o3r

The issue of unable to decode at full speed occured while playing the video "The Dark Knight" (also found under the same name in the log)

cheers

As noone else answers and seeing the 100% cpu utilization during the layback I`m prone to believing that the 8th gen intel integrated graphics doesn`t support the video format. I`ll replace the board with newer model with J4105 celeron that should support the format (at least what they are saying on Asrock site) and use the older MB for NAS build-up. Thanks for the answer smp