[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 #1 from kevin <kevinbing.song at gmail.com> ---
Created attachment 337553
  --> https://bugzilla.gnome.org/attachment.cgi?id=337553&action=edit
Need unref composition when remove video overlay composition meta

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