use max resolutions not first

pandora/archive/management/commands/import_streams.py

@@ -43,7 +43,7 @@ class Command(BaseCommand):
                                 stream.file.info = stream.info
                                 stream.file.save()
         #link streams
-        resolution = settings.CONFIG['video']['resolutions'][0]
+        resolution = max(settings.CONFIG['video']['resolutions'])
         format = settings.CONFIG['video']['formats'][0]
         for s in models.Stream.objects.exclude(format=format, resolution=resolution).filter(source=None):
             s.source = models.Stream.objects.get(file=s.file, resolution=resolution, format=format)

pandora/archive/models.py

@@ -250,7 +250,7 @@ class File(models.Model):
             config = settings.CONFIG['video']
             stream, created = Stream.objects.get_or_create(
                         file=self,
-                        resolution=config['resolutions'][0],
+                        resolution=max(config['resolutions']),
                         format=config['formats'][0])
             if created:
                 stream.video.name = stream.path(stream.name())

pandora/item/models.py

@@ -1232,7 +1232,7 @@ class Item(models.Model):
                 elif frames:
                     path = frames[int(len(frames)/2)]['path']
             else:
-                size = settings.CONFIG['video']['resolutions'][0]
+                size = max(settings.CONFIG['video']['resolutions'])
                 path = self.frame(self.poster_frame, size)
 
         return path