video_url = self._html_search_regex(r"video_url: '(.+?)/?',", webpage, 'video URL')
thumbnail = self._html_search_regex(r"preview_url: '(.+?)/?',", webpage, 'video thumbnail', fatal=False)
video_url = self._html_search_regex(r"video_url: '(.+?)/?',", webpage, 'video URL')
thumbnail = self._html_search_regex(r"preview_url: '(.+?)/?',", webpage, 'video thumbnail', fatal=False)