[pitivi] mediafilespreviewer: Consistent imports

[Mathieu Duponchelle <mathieudu src gnome org>]

commit 18fd3fbba1f283afed336e8835b31df7bd9de419
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Mon Jan 20 22:32:18 2014 +0100

    mediafilespreviewer: Consistent imports

 pitivi/mediafilespreviewer.py |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/pitivi/mediafilespreviewer.py b/pitivi/mediafilespreviewer.py
index 30a1727..71f9c90 100644
--- a/pitivi/mediafilespreviewer.py
+++ b/pitivi/mediafilespreviewer.py
@@ -29,7 +29,7 @@ from gi.repository import Gtk
 from gi.repository import Gdk
 from gi.repository import GdkPixbuf
 from gi.repository import Pango
-from gi.repository.GstPbutils import Discoverer
+from gi.repository import GstPbutils
 
 from pitivi.settings import GlobalSettings
 from pitivi.utils.loggable import Loggable
@@ -81,7 +81,7 @@ class PreviewWidget(Gtk.Grid, Loggable):
         self.preview_cache = {}
         self.preview_cache_errors = {}
 
-        self.discoverer = Discoverer.new(Gst.SECOND)
+        self.discoverer = GstPbutils.Discoverer.new(Gst.SECOND)
 
         #playbin for play pics
         self.player = AssetPipeline(clip=None, name="preview-player")