[Bug 772835] videooverlaycomposition: Need unref composition when remove video overlay composition meta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772835

--- Comment #9 from kevin <kevinbing.song at gmail.com> ---
Is there function to iterate composition? I remember video add timeoverlay and
clockoverlay have two compositions. Is it right?

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