[Bug 740557] videotestsrc: add ball motion based on system clock

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=740557
  GStreamer | gst-plugins-base | git

--- Comment #12 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-11-29 10:54:52 UTC ---
1/2 off compared to what? You should basically handle it like some random
number and only look at differences between those numbers (like the
documentation says). Do you want meaningful absolute values?

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