一、环境准备
ffmpeg下载：http://www.ffmpeg.org/download.html
x264下载：http://download.videolan.org/x264/snapshots/
yasm下载：http://yasm.tortall.net/Download.html
二、编译
1、编译yasm。
./configure --prefix=/usr/local/yasm
make
make install
2、解压x264，进入目录，输入：
./configure --prefix=/usr/local/x264 --enable-shared --enable-static --enable-yasm
make
make install
3、解压ffmpeg，进入目录，输入：
./configure --prefix=/usr/local/ffmpeg --enable-shared --enable-yasm --enable-libx264 --enable-gpl --enable-pthreads --extra-cflags=-I/usr/local/x264/include --extra-ldflags=-L/usr/local/x264/lib
make
make install
注意：
①在编译ffmpeg时，我是在vmware虚拟机下共享的windows目录下编译的，出现不支持ln操作的错误，解决办法是将ffmpeg在linux系统文件格式下解压编译。
②需要增加x264头文件及库的目录的字段。
三、编译完成后，修改环境编译，我在/etc/profile文件下增加如下字段：
GCCHOME=/usr/local/gcc-4.8.2
FFMPEG=/usr/local/ffmpeg
X264=/usr/local/x264
YASM=/usr/local/yasm
export GCCHOME PATH LD_LIBRARY_PATH FFMPEG X264 YASM
export QTCDIR=/opt/Qt/Tools/QtCreator
export PATH=$QTCDIR/bin:$GCCHOME/bin:$PATH:$FFMPEG/bin:$X264/bin:$YASM/bin
export MANPATH=$FFMPEG/share/man:$QTCDIR/man:$MANPATH
export LD_LIBRARY_PATH=$QTCDIR/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$YASM/lib:$X264/lib:$FFMPEG/lib:$GCCHOME/lib:$LD_LIBRARY_PATH:/usr/local/mpc-1.0.1/lib:/usr/local/gmp-6.0.0/lib:/usr/local/mpfr-3.1.2/lib
这样ffmpeg就能在linux环境下使用了。