[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 #6 from kevin <kevinbing.song at gmail.com> ---
(In reply to Tim-Philipp Müller from comment #4)
> > Interesting, that means when we add a video meta, unless we
> > cache the composition, we need to drop the extra ref.
> 
> In the usual case you attach the same composition to many video buffers, so
> that seems to make sense, no?
> 
> Kevin, please provide a minimal test case that leaks, or let us know if
> gst_buffer_remove_meta() is enough for your purposes.

Yes, our case is copy gstbuffer and attach the composition to new gstbuffer. it
will cause leaks evenif gst_buffer_remove_meta().

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