Simplify StreamInfo constructor

src/filter.py

@@ -26,7 +26,7 @@ class MissingDestination(Exception):
         Exception.__init__(self, "destination path " + dest.path + " not found")
 
 class StreamInfo(object):
-    def __init__(self, url, info, interhost):
+    def __init__(self, url, info, interhost = False):
         self.url = url
         self.info = info
         self.interhost = interhost