Starting in Ubuntu 17.10, totem (and some other apps like gnome-maps)
use Wayland subsurfaces by default. This means the video (or maps)
rectangle are able to redraw without redrawing the window decorations
and saves a lot of CPU.
A side-effect of this is that screenshots didn't seem to work any more.
However I believe that's just going to be a bug in gnome-shell/mutter,
for not being able to screenshot its own Wayland subsurfaces.
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu)
Status: New => Confirmed
** Changed in: mutter (Ubuntu)
Importance: Undecided => Low
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Changed in: gnome-shell (Ubuntu)
Status: New => Confirmed
** Changed in: gnome-shell (Ubuntu)
Importance: Undecided => Low
** Tags added: wayland
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https://bugs.launchpad.net/bugs/1721248
Title:
Totem could not get a screenshot of the video when using
gstreamer1.0-vaapi plugin on supported videos
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