webpage = self._download_webpage(url, video_id)
video_url = self._search_regex(
r'(?:file|source)=(http[^\'"&]*)', webpage, 'video URL')
webpage = self._download_webpage(url, video_id)
video_url = self._search_regex(
r'(?:file|source)=(http[^\'"&]*)', webpage, 'video URL')