一、Terminal终端输入：git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg
二、安装依赖环境：
sudo apt-get install -y autoconf automake build-essential git libass-dev libfreetype6-dev libsdl2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev pkg-config texinfo wget zlib1g-dev libavformat-dev libavcodec-dev libswresample-dev libswscale-dev libavutil-dev libsdl1.2-dev yasm libsdl2-dev libx264-dev libx265-dev libfdk-aac-dev
三、编译
1、./configure --enable-shared --prefix=./build --enable-gpl --enable-libx264 --enable-libx265
2、sudo make -j8
3、sudo make install
四、增加安装目录的动态链接库
1、Terminal终端输入sduo gedit /etc/ld.so.conf，添加/xxx/xxx/ffmpeg/build/lib
2、保存后，终端输入sudo ldconfig
五、添加到环境变量Path中
1、Terminal终端中输入：export PATH=/xxx/xxx/ffmpeg/build/bin/:$PATH
输入：env
2、或者:
sudo gedit ~/.bashrc
添加：
export PATH="$PATH:/xxx/ffmpeg/build/bin"
export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/xxx/ffmpeg/build/lib"
source ~/.bashrc
六、验证
Terminal终端输入：ffmpeg -version，结果如下，即为OK
