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ffmpeg下载：

http://ffmpeg.org/releases

可以下载适合自己的版本。我下载的是5.0版本，然后解压：

tar xvf ffmpeg-5.0.tar.gz

进入ffmpeg

cd ffmpeg-5.0

编译ffmpeg

./configure --prefix=/root/ffmpeg //编译文件存放的路径

如果是交叉编译添加以下参数：

./configure --prefix=/root/ffmpeg

--cross-prefix=arm-linux-

--enable-cross-compile

--target-os=linux

 --cc=arm-linux-gcc

 --arch=arm

--enable-shared//动态库

--disable-static//静态库

错误:

nasm/yasm not found or too old. Use --disable-x86asm for a crippled build.

解决方法：

sudo apt-get install yasm

sudo apt-get install nasm

也可以下载源码包：

wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz

wget https://www.nasm.us/pub/nasm/releasebuilds/2.14.02/nasm-2.14.02.tar.bz2

解压后进入目录：

./configure

make && make install

错误：

License: LGPL version 2.1 or later

libavutil/avconfig.h is unchanged

libavfilter/filter_list.c is unchanged

libavcodec/codec_list.c is unchanged

libavcodec/parser_list.c is unchanged

libavcodec/bsf_list.c is unchanged

libavformat/demuxer_list.c is unchanged

libavformat/muxer_list.c is unchanged

libavdevice/indev_list.c is unchanged

libavdevice/outdev_list.c is unchanged

libavformat/protocol_list.c is unchanged

ffbuild/config.sh is unchanged

不用在意说明已经成功配置ffmpeg

接下来：

make -j 4

make install

生成的头文件和库文件就在指定的目录中/root/ffmpeg。