video_url = xpath_text(video, './/video_url', 'video url', fatal=True)
formats = self._extract_f4m_formats(video_url, video_id, f4m_id='hds')
video_url = xpath_text(video, './/video_url', 'video url', fatal=True)
formats = self._extract_f4m_formats(video_url, video_id, f4m_id='hds')