diff --git a/oxtimelines/timeline.py b/oxtimelines/timeline.py
index 9624a06..8be0054 100644
--- a/oxtimelines/timeline.py
+++ b/oxtimelines/timeline.py
@@ -43,8 +43,11 @@ class Video(gst.Pipeline):
         self.sbin.props.expose_all_streams = True
         self.add(self.src, self.sbin)
 
+        info = ox.avinfo(uri)
+        self.audio = self.audio and info['audio'] != []
+        self.video = self.video and info['video'] != []
+
         if self.video:
-            info = ox.avinfo(uri)
             ratio = info['video'][0]['width'] / info['video'][0]['height']
             self.width = int(round(self.height * ratio))
             if self.width % 4: