Ubuntu下安装FFmpeg

1. 从FFmpeg的Github上下载源码

git clone https://git.ffmpeg.org/ffmpeg.git ffmpeg

2. 安装

./configure --prefix=/usr/local/ffmpeg --enable-shared --disable-static --disable-doc --enable-ffplay --disable-x86asm
make
sudo make install

3. 环境变量

sudo vim /etc/profile

添加以下内容

export FFMPEG_HOME=/usr/local/ffmpeg

export PATH=$PATH:$FFMPEG_HOME/bin
export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig

保存退出后，使配置生效

source /etc/profile

在/etc/ld.so.conf.d/下添加以下文件

ffmpeg.conf

内容为lib目录

/usr/local/ffmpeg/lib

使配置生效

sudo ldconfig

4. 配置pkg-config(可选)

mkdir /usr/local/lib/pkgconfig/
cp /usr/local/ffmpeg/lib/pkgconfig/*.pc /usr/local/lib/pkgconfig/

测试

pkg-config --libs libavcodec libavdevice libavfilter libavformat libavutil libswresample libswscale

编译方法

g++ main.c -o main.o -I /usr/ffmpeg/include `pkg-config libavcodec libavdevice libavfilter libavformat libavutil libswresample libswscale --cflags --libs`

相当于

g++ main.c -o main.o -I /usr/local/ffmpeg/include -L /usr/ffmpeg/lib -lavcodec -lavdevice -lavfilter -lavformat -lavutil -lswresample -lswscale

========================== 2019.7.17 补充 ==========================

添加libx264

git clone http://git.videolan.org/git/x264.git
cd x264/
./configure --enable-shared --disable-asm
make
sudo make install

重新编译FFmpeg

./configure --prefix=/usr/ffmpeg --enable-shared --disable-static --disable-doc --enable-libx264 --enable-gpl --disable-asm

参考：
https://www.cnblogs.com/boonya/p/8571934.html
https://blog.csdn.net/liangchunjiang/article/details/78774643