[Bug 796890] d3d: d3d_wnd_proc (d3dhelper.c) raises an exception because sink is NULL at LOCK_SINK (sink);

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796890

--- Comment #4 from Marcos Kintschner <marcos.ktn at gmail.com> ---
Created attachment 373232
  --> https://bugzilla.gnome.org/attachment.cgi?id=373232&action=edit
D3d console error with a single pipeline

I've just tested it with a single pipeline, and it seems to be a race condition
between the main thread and the queue thread of the pipeline.

The simplified version of the pipeline is:

ksvideosrc ! capsfilter ! tee name=t t. ! queue ! videoconvert ! d3dvideosink

I think adding a simple condition variable to control the order of read/write
of "GstD3DVideoSink" prop of the window would suffice.

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