gst_system_clock_start_async  114 gst/gstsystemclock.c static gboolean gst_system_clock_start_async (GstSystemClock * clock);
gst_system_clock_start_async  179 gst/gstsystemclock.c   gst_system_clock_start_async (clock);
gst_system_clock_start_async  757 gst/gstsystemclock.c   if (G_UNLIKELY (!gst_system_clock_start_async (sysclock)))