wget --header="Referer: http://static.youku.com/v1.0.0123/v/swf/qplayer.swf" --header="x-flash-version: 10,1,82,76" --header="User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1;)" http://122.227.216.108/youku/197123D0F014583DF7384C317B/03000201004BBCF0BB60440093DA2B1C15042B-DD46-5596-1C86-F8D73656ECC1.flv -O taiji.flv
wget的header参数，可以多次设置。
优酷的下载限制是UserAgent。