[pitivi] ui: make get_preview_from_object simpler

[Edward Hervey <edwardrv src gnome org>]

commit 61a3ceb89244b3ae7ac2eecbcfb319195510d31b
Author: Alessandro Decina <alessandro d gmail com>
Date:   Tue Sep 7 16:09:33 2010 +0200

    ui: make get_preview_from_object simpler

 pitivi/ui/previewer.py |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)
---
diff --git a/pitivi/ui/previewer.py b/pitivi/ui/previewer.py
index a356542..f0dcdd2 100644
--- a/pitivi/ui/previewer.py
+++ b/pitivi/ui/previewer.py
@@ -109,12 +109,7 @@ previewers = {}
 
 def get_preview_for_object(instance, trackobject):
     factory = trackobject.factory
-    for stream_ in factory.getOutputStreams():
-        if stream_.isCompatible(trackobject.track.stream):
-            break
-        stream_ = None
-    if not stream_:
-        raise NotImplementedError
+    stream_ = trackobject.stream
     stream_type = type(stream_)
     key = factory, stream_
     if not key in previewers: