ffmpeg

http://www.linjie.org/2015/08/06/amr格式转mp3格式-完美解决Linux下转换0K问题/

http://mfan.iteye.com/blog/2032454

http://blog.csdn.net/fjh658/article/details/12869073

http://blog.163.com/guo_aqi/blog/static/1340708532014119114917367/

http://www.cnblogs.com/xiaofengfeng/p/3573025.html

http://thierry-xing.iteye.com/blog/2017864

http://www.cnblogs.com/wanghetao/p/3386311.html