if the MS wasn't ready on the first browse, react on its SystemUpdateID event

media_renderer

@@ -173,6 +173,13 @@ class MediaRenderer(object):
         print variable.name, 'changed from', variable.old_value, 'to', variable.value
         if variable.old_value == '':
             return
+        if variable.name == 'SystemUpdateID':
+            if self.client.has_key(usn) == True:
+                if len(self.images) == 0:
+                    d = self.client[usn].content_directory.browse(0, browse_flag='BrowseDirectChildren',
+                                                             backward_compatibility=False)
+                    d.addCallback( self.process_media_server_browse, usn)
+
         if variable.name == 'ContainerUpdateIDs':
             changes = variable.value.split(',')
             while len(changes) > 1: