[Bug 777146] vaapisink: segfault caused by race condition with OverlayInterface expose method

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777146

--- Comment #1 from Matt Staples <staples255 at gmail.com> ---
Created attachment 343315
  --> https://bugzilla.gnome.org/attachment.cgi?id=343315&action=edit
Add mutex protection around video_buffer member variable

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