def sina_download_by_vid(vid, title=None, output_dir='.', merge=True, info_only=False):
 xml = video_info_xml(vid)
 sina_download_by_xml(xml, title, output_dir, merge, info_only)

def sina_download_by_vid ( vid , title = None , output_dir = '.' , merge = True , info_only = False ) : xml = video_info_xml ( vid ) sina_download_by_xml ( xml , title , output_dir , merge , info_only )
downloads a sina video by its unique vid .