解决找不到库文件error while loading shared libraries: libfaad.so.2: cannot open shared object file: No such

1. 在安装好mplayer，运行mplayer和mencoder时提示找不到库文件
   mplayer: error while loading shared libraries: libfaad.so.2: cannot open shared object file: No such file or directory
   mencoder: error while loading shared libraries: libfaad.so.2: cannot open shared object file: No such file or directory
   
2. 修改/etc/ld.so.conf，增加/usr/local/lib
   
3. 运行ldconfig命令
4. 重新运行命令无报错了。