video: Realize the media stream before setting a file

This makes it so that we obtain a GL context before
creating the GstSink, so we at least advertise our
ability to handle GL buffer.

Gstreamer still won't send us any.

1 files changed, 7 insertions, 1 deletions

diff --git a/gtk/gtkvideo.c b/gtk/gtkvideo.c
index 15a5e25a36..f5b6f303e0 100644
--- a/gtk/gtkvideo.c
+++ b/gtk/gtkvideo.c
@@ -688,7 +688,13 @@ gtk_video_set_file (GtkVideo *self,
       stream = gtk_media_file_new ();
 
       if (gtk_widget_get_realized (GTK_WIDGET (self)))
-        gtk_media_file_set_file (GTK_MEDIA_FILE (stream), file);
+        {
+          GdkSurface *surface;
+
+          surface = gtk_native_get_surface (gtk_widget_get_native (GTK_WIDGET (self)));
+          gtk_media_stream_realize (stream, surface);
+          gtk_media_file_set_file (GTK_MEDIA_FILE (stream), file);
+        }
       gtk_video_set_media_stream (self, stream);
 
       g_object_unref (stream);