Ubuntu20.04下载安装FFmpeg源码，并且编译FFmpeg

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