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)

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https://bugs.launchpad.net/bugs/1698270

Title:
  Totem pauses and stutters during video playback even when CPU usage is
  low

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