ffmpeg+libmp3lame库源码安装教程（CentOS）
lame--libmp3lame的安装包，支持MP3编码；yasm--NASM的重写，用于编译ffmpeg。
1.下载
ffmpeg下载链接：http://ffmpeg.org/download.html
yasm下载链接：http://www.linuxfromscratch.org/blfs/view/svn/general/yasm.html
lame下载接：https://sourceforge.net/projects/lame/files/lame/
2.编译安装
2.1安装lame
tar -zxf lame-3.100.tar.gz cd lame-3.100 ./configure make make install
2.2安装yasm
tar -zxf yasm-1.3.0.tar.gz cd yasm-1.3.0 sed -i 's#) ytasm.*#)#' Makefile.in ./configure make make install
2.3安装ffmpeg
tar -jxf ffmpeg-3.4.tar.bz2 cd ffmpeg-3.4 ./configure --enable-shared --enable-libmp3lame make make install
3.配置调整
执行：ffmpeg --version
报错：ffmpeg: error while loading shared libraries: libavdevice.so.57: cannot open shared object file: No such file or directory
解决：编缉/etc/ld.so.conf，新建一行追加：/usr/local/lib；保存后执行命令重加载配置文件：ldconfig
参考：
http://www.cnblogs.com/wanghetao/p/3386311.html
http://www.linuxfromscratch.org/blfs/view/svn/general/yasm.html
