support gst debug logging

annotation_pipeline/ingest.cpp

@@ -152,6 +152,8 @@ main (int argc, char *argv[])
   GIOChannel *io_stdin = nullptr;
 
   /* Initialize GStreamer */
+  if (argc > 2)
+	  gst_debug_set_threshold_from_string(argv[2], TRUE);
   gst_init (&argc, &argv);
 
   /* Initialize our data structure */