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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Touch seeded packages, which is subscribed to gtk+3.0 in Ubuntu.

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

Status in GTK+:
  Fix Released
Status in totem-pl-parser:
Status in clutter-1.0 package in Ubuntu:
  Won't Fix
Status in clutter-gtk package in Ubuntu:
  Fix Released
Status in gtk+3.0 package in Ubuntu:
  Fix Released
Status in totem package in Ubuntu:
Status in totem-pl-parser package in Ubuntu:
  Fix Released

Bug description:
  Totem pauses and stutters during video playback even when CPU usage is

  After figuring out how to play videos with full hardware accelerated
  decoding (e.g. <= 10% CPU), I was surprised to find Totem still pauses
  and stutters during playback. Other apps like Mplayer, VLC and even
  gst-play-1.0 never have this problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: totem 3.24.0-0ubuntu1
  ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
  Uname: Linux 4.10.0-22-generic x86_64
  ApportVersion: 2.20.5-0ubuntu4
  Architecture: amd64
  Date: Fri Jun 16 12:03:18 2017
  InstallationDate: Installed on 2017-05-03 (44 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170502)
  SourcePackage: totem
  UpgradeStatus: No upgrade log present (probably fresh install)

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