s = (GstStructure *) gst_message_get_structure (msg);
gst_structure_get (s, "bin.old.context", GST_TYPE_CONTEXT, &context, NULL);
gst_structure_remove_field (s, "bin.old.context");
s = (GstStructure *) gst_message_get_structure (msg);
gst_structure_get (s, "bin.old.context", GST_TYPE_CONTEXT, &context, NULL);
gst_structure_remove_field (s, "bin.old.context");