[pitivi] pipeline: Handle negative position when pausing

[Mathieu Duponchelle <mathieudu src gnome org>]

commit 1af6c48813c290c01d314724c3ac92835aa87dee
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Mon Jan 6 18:19:13 2014 +0100

    pipeline: Handle negative position when pausing
    
    This happens immediately after a render operation.

 pitivi/utils/pipeline.py |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/pitivi/utils/pipeline.py b/pitivi/utils/pipeline.py
index 244d35e..6bd544c 100644
--- a/pitivi/utils/pipeline.py
+++ b/pitivi/utils/pipeline.py
@@ -244,10 +244,12 @@ class SimplePipeline(Signallable, Loggable):
         # is only emitted every 300ms and the playhead jumps
         # during the playback.
         try:
-            self.emit("position", self.getPosition())
+            position = self.getPosition()
         except PipelineError:
             # Getting the position failed
-            pass
+            return
+        if position != Gst.CLOCK_TIME_NONE and position >= 0:
+            self.emit("position", position)
 
     def stop(self):
         """
@@ -273,7 +275,6 @@ class SimplePipeline(Signallable, Loggable):
         @rtype: L{long}
         @raise PipelineError: If the position couldn't be obtained.
         """
-        self.log("format %r", format)
         try:
             res, cur = self._pipeline.query_position(format)
         except Exception, e: