fix bug handling audio fallback detection, resolves #31

tubesync/sync/matching.py

@@ -66,7 +66,7 @@ def get_best_audio_format(media):
     # No codecs matched
     if media.source.can_fallback:
         # Can fallback, find the next highest bitrate non-matching codec
-        return False, audio_formats[0]
+        return False, audio_formats[0]['id']
     else:
         # Can't fallback
         return False, False

tubesync/sync/models.py

@@ -839,8 +839,9 @@ class Media(models.Model):
             fmt.append(resolution)
             vcodec = vformat['vcodec'].lower()
             fmt.append(vcodec)
-        acodec = aformat['acodec'].lower()
-        fmt.append(acodec)
+        if aformat:
+            acodec = aformat['acodec'].lower()
+            fmt.append(acodec)
         if vformat:
             if vformat['is_60fps']:
                 fps = '60fps'