Gstreamer Editing Service Set Window Handle

[killerrats]

this is before even playing the preview it will error out on setting the
overlay. I set it to Render Mode and later will set to preview mode.
setup...

	gespipeline = ges_pipeline_new();

	// Setup audio & video sinks
	GstElement *audioSink = gst_element_factory_make("directsoundsink",
"audio-sink");
	ges_pipeline_preview_set_audio_sink(this->gespipeline, audioSink);

	GstElement *videoSink = gst_element_factory_make("d3dvideosink",
"video-sink");
	ges_pipeline_preview_set_video_sink(this->gespipeline, videoSink);

	GstVideoOverlay* vOverlay = GST_VIDEO_OVERLAY(gespipeline);
	if (this->_windows_handle > 0)
		gst_video_overlay_set_window_handle(vOverlay, this->_windows_handle);
	gst_object_unref(vOverlay);

	timeline = ges_timeline_new();
	a = GES_TRACK(ges_audio_track_new())
		, v = GES_TRACK(ges_video_track_new());
	ges_pipeline_set_timeline(gespipeline, timeline);
	ges_timeline_add_track(timeline, v);
	ges_timeline_add_track(timeline, a);
... Add tracks();
	ges_timeline_commit(timeline);
ges_pipeline_set_render_settings(gespipeline, uri, mediacat_gen_profile());
	this->mediacat_set_output(GES_PIPELINE_MODE_RENDER);

error happens:

"(CombineVideoFiles.exe:58456): GES-CRITICAL **:
ges_pipeline_set_render_settings: assertion 'GES_IS_PIPELINE (pipeline)'
failed

(CombineVideoFiles.exe:58456): GES-CRITICAL **: ges_pipeline_set_mode:
assertion 'GES_IS_PIPELINE (pipeline)' failed

(CombineVideoFiles.exe:58456): GLib-GObject-WARNING **: invalid unclassed
pointer in cast to 'GstElement'
"



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Gstreamer 1.14.3
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Windows
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