webpage = self._download_webpage(url, video_id, 'Downloading page')
 
         mobj = re.search(r'(?m)fo\.addVariable\("file",\s"(?P<fileid>[\da-z]+)"\);\n'
         webpage = self._download_webpage(url, video_id, 'Downloading page')
 
         mobj = re.search(r'(?m)fo\.addVariable\("file",\s"(?P<fileid>[\da-z]+)"\);\n'