video = config.find('video')
sources = video.find('sources')
url_node = next(node for node in [find_xpath_attr(sources, 'source', 'id', 'HQ %s' % key)
video = config.find('video')
sources = video.find('sources')
url_node = next(node for node in [find_xpath_attr(sources, 'source', 'id', 'HQ %s' % key)