环境：
centos 7.4
下载nasm（x264依赖）
wget https://www.nasm.us/pub/nasm/releasebuilds/2.14.02/nasm-2.14.02.tar.xz
tar xvf nasm-2.14.02.tar.xz
cd nasm-2.14.02
./configure 安装到默认目录下
make
make install
下载x264
wget ftp://ftp.videolan.org/pub/x264/snapshots/last_x264.tar.bz2
tar xvf last_x264.tar.bz2
cd x264-snapshot-20190129-2245/
./configure --prefix=/opt/x264_install --enable-static --disable-shared
make -j4
make install
下载ffmpeg
wget https://ffmpeg.org/releases/ffmpeg-4.1.tar.bz2
tar xvf ffmpeg-4.1.tar.bz2
cd ffmpeg-4.1
./configure --prefix=/opt/ffmpeg_install --enable-gpl --enable-version3 --enable-static --enable-libx264 --extra-cflags='-I/opt/x264_install/include' --extra-ldflags='-L/opt/x264_install/lib -lx264 -lpthread -lm -ldl' --enable-static --disable-shared --enable-pthreads --enable-encoder=libx264
make -j4
make install
测试：
cd /opt/ffmpeg_install/bin
ldd ffmpeg
