Index: telemeta/models/media.py
===================================================================
--- telemeta/models/media.py	(revision 6229b12eb6a3c2c64161586acb5d47f417d68ea0)
+++ telemeta/models/media.py	(revision 33d177aeb52afd1ec074f085efaf825fbfb8e3cb)
@@ -468,5 +468,5 @@
     def to_dict(self):
         if self.analyzer_id == 'duration':
-            if '.' in value:
+            if '.' in self.value:
                 value = self.value.split('.')
                 self.value = '.'.join([value[0], value[1][:2]])