[pitivi] previewers: query_success can be true and duration == -1.

[Thibault Saunier <tsaunier src gnome org>]

commit ca59e8454943d7a16a29f2dde428ebce3f5cf3bc
Author: Mathieu Duponchelle <mathieu duponchelle epitech eu>
Date:   Thu Sep 26 03:41:18 2013 +0200

    previewers: query_success can be true and duration == -1.
    
    In that case use track element duration.

 pitivi/timeline/previewers.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/previewers.py b/pitivi/timeline/previewers.py
index 8be06df..ddcbcef 100644
--- a/pitivi/timeline/previewers.py
+++ b/pitivi/timeline/previewers.py
@@ -272,7 +272,7 @@ class VideoPreviewer(Clutter.ScrollActor, PreviewGenerator, Zoomable, Loggable):
         self.debug('Now generating thumbnails for "%s"' % filename_from_uri(self.uri))
         self.queue = []
         query_success, duration = self.pipeline.query_duration(Gst.Format.TIME)
-        if not query_success:
+        if not query_success or duration == -1:
             self.debug("Could not determine duration of %s" % self.uri)
             duration = self.duration
         else: