diff -urN tumbler-0.1.22/plugins/gst-thumbnailer/gst-helper.c tumbler-0.1.22_gst-pipeline-start/plugins/gst-thumbnailer/gst-helper.c
--- tumbler-0.1.22/plugins/gst-thumbnailer/gst-helper.c	2011-08-06 22:51:46.000000000 +0900
+++ tumbler-0.1.22_gst-pipeline-start/plugins/gst-thumbnailer/gst-helper.c	2011-10-17 22:51:55.618974867 +0900
@@ -154,6 +154,8 @@
 
   bus = gst_element_get_bus (GST_ELEMENT (pipeline));
 
+  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_PLAYING);
+
   i = 0;
   msg = NULL;
   while (msg == NULL && i < 5)