http://lib.csdn.net/liveplay/knowledge/1586
http://blog.csdn.net/fireroll/article/details/27992913
ffmpeg filter过滤器 基础实例及全面解析
http://lib.csdn.net/article/liveplay/37149
ffmpeg常用命令
http://blog.csdn.net/newchenxf/article/details/51384360
原文：http://www.cnblogs.com/vincentqliu/p/7522105.html