[Bug 760873] GstGLVideoMixerPad vertex_buffer leaks when pad dynamic removed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=760873

--- Comment #5 from comicfans44 <comicfans44 at gmail.com> ---
after some trace, seems that video_mixer->process_textures(or maybe
aggregator->aggregate) didn't consider pad remove event, I can confirm
gst_gl_video_mixer_callback will use GstGLMixerFrameData after release_pad 
is called, so it may use invalid data (it has GstGLVideoMixerPad reference so 
re-generated the vertex buffer after pad is released, trigger leaks).

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