def sina_download_by_vid(vid, title=None, output_dir='<STR_LIT:.>', merge=True, info_only=False):
xml = api_req(vid)<EOL>urls, name, size = video_info(xml)<EOL>if urls is None:<EOL><INDENT>log.wtf(name)<EOL><DEDENT>title = name<EOL>print_info(site_info, title, '<STR_LIT>', size)<EOL>if not info_only:<EOL><INDENT>download_urls(urls, title, '<STR_LIT>', size, output_dir = output_dir, merge = merge)<EOL><DEDENT>
Downloads a Sina video by its unique vid.
    http://video.sina.com.cn/