make subtitles in/out/value unique before importing

pandora/archive/models.py

@@ -279,7 +279,13 @@ class File(models.Model):
         return None
 
     def srt(self, offset=0):
-        srt = ox.srt.load(self.data.path)
+        srt = []
+        subtitles = []
+        for s in ox.srt.load(self.data.path):
+            key = '%s --> %s\n%s' % (s['in'], s['out'], s['value'])
+            if key not in subtitles:
+                subtitles.append(key)
+                srt.append(s)
         #subtitles should not overlap
         for i in range(1, len(srt)):
             if srt[i-1]['out'] > srt[i]['in']: