See:
	https://issues.mediagoblin.org/ticket/5399

--- mediagoblin/media_types/video/transcoders.py	2015-12-20 11:25:11.000000000 -0500
+++ mediagoblin/media_types/video/transcoders.py	2016-01-20 00:21:47.159639000 -0500
@@ -32,5 +32,5 @@
 import gi
 gi.require_version('Gst', '1.0')
-from gi.repository import GObject, Gst
+from gi.repository import GLib, Gst
 Gst.init(None)
 
@@ -153,5 +153,5 @@
         _log.info('Initializing VideoTranscoder...')
         self.progress_percentage = None
-        self.loop = GObject.MainLoop()
+        self.loop = GLib.MainLoop()
 
     def transcode(self, src, dst, **kwargs):
@@ -370,9 +370,9 @@
 
         # This kills the loop, mercifully
-        GObject.idle_add(self.__stop_mainloop)
+        GLib.idle_add(self.__stop_mainloop)
 
     def __stop_mainloop(self):
         '''
-        Wrapper for GObject.MainLoop.quit()
+        Wrapper for GLib.MainLoop.quit()
 
         This wrapper makes us able to see if self.loop.quit has been called