I'm really not sure what changed to make 4K video so stuttery now in totem. The CPU is fairly low and goes through the roof only if I uninstall VAAPI. So VAAPI is working, and it works smoothly in mpv too.
Since I could last play 4K smoothly in totem there has been:
* A mesa update 17.2 -> 18.0
* A Xorg update 1.19.5 -> 1.19.6
* Kernel updates
* Hardware changes (I changed from a Haswell to Kaby Lake desktop)
I'm really not sure what changed to make 4K video so stuttery now in totem. The CPU is fairly low and goes through the roof only if I uninstall VAAPI. So VAAPI is working, and it works smoothly in mpv too.
Since I could last play 4K smoothly in totem there has been:
* A mesa update 17.2 -> 18.0
* A Xorg update 1.19.5 -> 1.19.6
* Kernel updates
* Hardware changes (I changed from a Haswell to Kaby Lake desktop)