一篇不错的v4l2入门文档 http://blog.chinaunix.net/uid-26851094-id-3270803.html 古有内事不决问张昭，外事不决问周瑜； 今有生活不懂问百度，学术不懂问谷歌。 (SunQuan)The inner undecided ask ZhangZhao, the outer undecided ask ZhouYu. (I)Life unknown ask Baidu, academic unknown ask Google.