Smoothness issue 4 above I have tracked down to this clutter-gtk code:
-------------------------
static void
clutter_master_clock_gdk_update (GdkFrameClock *frame_clock,
ClutterMasterClockGdk *master_clock)
{
GList *stages, *l;
_clutter_threads_acquire_lock ();
/* Get the time to use for this frame */
master_clock->cur_tick = gdk_frame_clock_get_frame_time (frame_clock);
-------------------------
The problem is not in clutter-gtk though. It's a general lack of
precision in the GdkFrameClock logic. Despite my monitor running at
around 60Hz, the GDK frame_time interval is erratic and mostly varies
between 17 and 18 milliseconds. So the root cause is just poor timing
logic in GDK.
I have an experimental fix already for gdk so probably don't need to
propose changes to clutter-gtk any more.
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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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