+        def decode_url(encoded_url):
+            return compat_b64decode(encoded_url).decode('utf-8')
+
+        stream_url = url_or_none(decode_url(self._search_regex(
+            r'data-stream\s*=\s*(["\'])(?P<url>(?:(?!\1).)+)\1', webpage,
+            'stream url', default=None, group='url')))
+        if stream_url:
+            return stream_url