timeout if no frame is found

oxgst/video.py

@@ -125,8 +125,18 @@ class Video(gst.Pipeline):
         def callback(frame, timestamp):
             self._frames[timestamp] = frame
             self.mainloop.quit()
+        self._quit = False
+        def quit():
+            if self._quit:
+                self.mainloop.quit()
+                return False
+            else:
+                self._quit = True
+                return True
+        gobject.timeout_add(1000, quit)
         if self.getFrame(timestamp, callback):
             self.mainloop.run()
+
         frame = self._frames[timestamp]
         del self._frames[timestamp]
         return frame