Core i7-6700K can not do UHD HEVC?

Hi,

using a 1080p display with a Core i7-6700K at stock clocks paired with 32GB dual channel DDR4-3000 memory, running Xubuntu 16.04 with the following PPAs:

https://launchpad.net/~oibaf/+archive/ub…cs-drivers
https://launchpad.net/~wsnipex/+archive/ubuntu/vaapi
https://launchpad.net/~mc3man/+archive/ubuntu/mpv-tests
https://launchpad.net/~team-xbmc/+archiv…mc-nightly

With VAAPI enabled, playing back the following file for example:

http://demo-uhd3d.com/fiche.php?cat=uhd&id=143

results in some hefty clored blocking artifacts throughout the entire playback. The playback itself seems to be smooth though (no stutter).

When disabling VAAPI (software decoding then probably), the artifacts are gone, but the framerate is horrible.

Same happens when playing it back via mpv.

What could that be?

Even if it doesn’t work with VAAPI, a Core i7-6700K should still be able to decode UHD HEVC in software, shouldn’t it?