-        video_url = self._html_search_regex(
-            r'setup\(\{\s+"file".+: "([^"]+)",', webpage, 'video URL')
+        video_url = (self._html_search_regex(
+            (r'setup\(\{\s*["\']file["\']\s*:\s*(["\'])(?P<url>(?:(?!\1).)+)\1',
+             r'fileurl\s*=\s*(["\'])(?P<url>(?:(?!\1).)+)\1'),
+            webpage, 'video URL', default=None, group='url')
+            or 'http://cdn4.videos.motherlessmedia.com/videos/%s.mp4?fs=opencloud' % video_id)