[pitivi] Use urlsafe_b64encode to generate thumbnail names.

[Edward Hervey <edwardrv src gnome org>]

commit aa962042a623643bda275270445c7eddb644260b
Author: Alessandro Decina <alessandro d gmail com>
Date:   Mon Apr 27 17:42:54 2009 +0200

    Use urlsafe_b64encode to generate thumbnail names.
    
    Fixes #576872.
---
 pitivi/discoverer.py |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/pitivi/discoverer.py b/pitivi/discoverer.py
index 1c3752d..d798aeb 100644
--- a/pitivi/discoverer.py
+++ b/pitivi/discoverer.py
@@ -32,6 +32,7 @@ gobject.threads_init()
 import gst
 import gst.pbutils
 import tempfile
+from base64 import urlsafe_b64encode
 
 from pitivi.log.loggable import Loggable
 from pitivi.factories.file import FileSourceFactory, PictureFileSourceFactory
@@ -390,7 +391,7 @@ class Discoverer(object, Signallable, Loggable):
     def _getThumbnailFilenameFromPad(self, pad):
         tmp = tempfile.gettempdir()
         name = '%s.%s' % (self.current_uri, pad.get_name())
-        name = name.encode('base64').replace('\n', '') + '.png'
+        name = urlsafe_b64encode(name) + '.png'
         filename = os.path.join(tmp, name)
 
         return filename