[pitivi] Set pngenc in snapshot mode inside discoverer.

[Edward Hervey <edwardrv src gnome org>]

commit 4369c0ee2c47e660031e8727313d8d03de0d5081
Author: Alessandro Decina <alessandro d gmail com>
Date:   Wed Jul 29 14:57:42 2009 +0200

    Set pngenc in snapshot mode inside discoverer.

 pitivi/discoverer.py |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/discoverer.py b/pitivi/discoverer.py
index 5aba1fd..f3c406b 100644
--- a/pitivi/discoverer.py
+++ b/pitivi/discoverer.py
@@ -489,6 +489,7 @@ class Discoverer(Signallable, Loggable):
         vscale.props.method = 0
         csp = gst.element_factory_make("ffmpegcolorspace")
         pngenc = gst.element_factory_make("pngenc")
+        pngenc.props.snapshot = True
         pngsink = gst.element_factory_make("filesink")
         self.thumbnails[pad] = thumbnail = self._getThumbnailFilenameFromPad(pad)
         pngsink.props.location = thumbnail