diff --git a/pandora/archive/models.py b/pandora/archive/models.py
index 08a06b7c9..f7d1a6594 100644
--- a/pandora/archive/models.py
+++ b/pandora/archive/models.py
@@ -472,7 +472,9 @@ class Stream(models.Model):
     source = models.ForeignKey('Stream', related_name='derivatives', default=None, null=True)
     available = models.BooleanField(default=False)
     info = fields.DictField(default={})
-    
+    duration = models.FloatField(default=0)
+    aspect_ratio = models.FloatField(default=0)
+
     @property
     def timeline_prefix(self):
         return os.path.join(settings.MEDIA_ROOT, self.path(), 'timeline')
@@ -518,8 +520,24 @@ class Stream(models.Model):
     def save(self, *args, **kwargs):
         if self.video and not self.info:
             self.info = ox.avinfo(self.video.path)
+        self.duration = self.info.get('duration', 0)
+        if 'video' in self.info and self.info['video']:
+            self.aspect_ratio = self.info['video'][0]['width'] / self.info['video'][0]['height']
+        else:
+            self.aspect_ratio = 128/80
         super(Stream, self).save(*args, **kwargs)
 
+    def json(self):
+        if settings.XSENDFILE or settings.XACCELREDIRECT:
+            base_url = '/%s' % self.itemId
+        else:
+            base_url = os.path.dirname(self.video.url)
+        return {
+            'duration': self.duration,
+            'aspectRatio': self.aspect_ratio,
+            'baseUrl': base_url
+        }
+
 def delete_stream(sender, **kwargs):
     f = kwargs['instance']
     if f.video:
diff --git a/pandora/item/models.py b/pandora/item/models.py
index 7baa0f34a..797e437d9 100644
--- a/pandora/item/models.py
+++ b/pandora/item/models.py
@@ -295,7 +295,6 @@ class Item(models.Model):
             shutil.rmtree(path)
 
     def delete(self, *args, **kwargs):
-        self.streams.all().delete()
         self.delete_files()
         super(Item, self).delete(*args, **kwargs)
 
@@ -391,21 +390,8 @@ class Item(models.Model):
         return frames
 
     def get_stream(self):
-        stream = {}
-        videos = self.main_videos()
-        for video in videos:
-            s = video.streams.all()[0]
-            if s.video and s.info:
-                stream['duration'] = s.info['duration']
-                if 'video' in s.info and s.info['video']:
-                    stream['aspectRatio'] = s.info['video'][0]['width'] / s.info['video'][0]['height']
-                else:
-                    stream['aspectRatio'] = 128/80
-                if settings.XSENDFILE or settings.XACCELREDIRECT:
-                    stream['baseUrl'] = '/%s' % self.itemId
-                else:
-                    stream['baseUrl'] = os.path.dirname(s.video.url)
-        return stream
+        for s in self.streams():
+            return s.json()
 
     def get_layers(self, user=None):
         layers = {}
@@ -450,9 +436,8 @@ class Item(models.Model):
         if not keys or 'poster' in keys:
             i['poster'] = self.get_poster()
 
-        videos = self.main_videos()
-        i['duration'] = sum([v.duration for v in videos])
-        i['durations'] = [v.duration for v in videos]
+        i['durations'] = [s.duration for s in self.streams()]
+        i['duration'] = sum(i['durations'])
         i['apsectRatio'] = i.get('aspectratio')
 
         #only needed by admins
@@ -704,18 +689,12 @@ class Item(models.Model):
     '''
     def frame(self, position, height=128):
         offset = 0
-        videos = self.main_videos()
-        for video in videos:
-            if video.duration + offset < position:
-                offset += video.duration
+        streams = self.streams()
+        for stream in streams:
+            if stream.duration + offset < position:
+                offset += stream.duration
             else:
                 position = position - offset
-                stream = video.streams.filter(resolution=settings.VIDEO_RESOLUTIONS[0],
-                                              format=settings.VIDEO_FORMATS[0])
-                if stream.count()>0:
-                    stream = stream[0]
-                else:
-                    return None
                 height = min(height, stream.resolution)
                 path = os.path.join(settings.MEDIA_ROOT, stream.path(),
                                     'frames', "%dp"%height, "%s.jpg"%position)
@@ -812,6 +791,9 @@ class Item(models.Model):
         self.torrent.name = self.path('torrent/%s.torrent' % self.get('title'))
         self.save()
 
+    def streams(self):
+        return [video.streams.filter(source=None)[0] for video in self.main_videos()]
+
     def update_streams(self, force=False):
         files = {}
         for f in self.main_videos():