don't encode urls, just pass strings

feed

@@ -101,7 +101,7 @@ class Audio(object):
     def __init__(self, url, duration=None, date=None):
         self.url = url
         if duration is None:
-            duration = get_duration(url.encode("utf-8"))
+            duration = get_duration(url)
         self.duration = duration
         self.date = date
         self.end_date = datetime.datetime(9999, 12, 31, tzinfo=datetime.timezone.utc)