[Bug 760873] GstGLVideoMixerPad vertex_buffer leaks when pad dynamic removed

[GStreamer (GNOME Bugzilla)]

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

--- Comment #4 from comicfans44 <comicfans44 at gmail.com> ---
Created attachment 319478
  --> https://bugzilla.gnome.org/attachment.cgi?id=319478&action=edit
misc patch to avoid pad's vertex buffer when dynamic release_pad

I'm not sure if I should lock something in 
release_pad / _reset_pad_gl / gst_gl_video_mixer_callback 

before check and modify pad->vertex_buffer.


after applying this patch , some leaks disappear, but still one Buffer Object
leak reported by apitrace (recently it gains a basic leak trace function)

this leak should be gst_gl_video_mixer_callback:1146, gen pad's vertex buffer

I'm still tracing it so I didn't submit this early.

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