Ubuntu下FFmpeg源码编译安装流程

起因

自学视音频编解码，先从FFmpeg开始。本文记录下载、编译、安装FFmpeg的全过程。

下载编译安装

下载

命令

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

配置，编译FFmpeg

1，安装yasm
1
sudo apt install yasm
2，创建一个ffmpeg_install的目录，存放编译生成的文件
1
sudo mkdir ffmpeg_install

3，在ffmpge源码文件夹下运行命令

1	./configure --prefix=../ffmpeg-src/ffmpeg_install

另外，可以根据./configure --help命令来查看关于FFMPEG的配置参数。

4，编译安装
1
2
make -j16
make install

接着我们就可以在ffmpeg_install这个文件夹下看到如下目录

.
├── bin
├── include
├── lib
├── share

5，生成可执行文件

在bin目录下执行这条命令

./ffmpeg

报错
./ffmpeg: error while loading shared libraries: libavdevice.so.57: cannot open shared object file: No such file or directory

系统提示找不到动态库，我们用ldd ffmpeg命令看看运行当前可执行文件需要哪些动态库

$ ldd ffmpeg
	linux-vdso.so.1 (0x00007ffdf7584000)
	libavdevice.so.58 => not found
	libavfilter.so.7 => not found
	libavformat.so.58 => not found
	libavcodec.so.58 => not found
	libswresample.so.3 => not found
	libswscale.so.5 => not found
	libavutil.so.56 => not found
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fc3e2f66000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fc3e2d47000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fc3e2956000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fc3e3546000)

6，配置环境变量
1
$ export LD_LIBRARY_PATH=lib/

在./ffmpeg_install/bin目录下运行

1	$ export LD_LIBRARY_PATH=../lib/

此时我们再运行ldd ffmpeg命令查看

$ ldd ffmpeg
	linux-vdso.so.1 (0x00007ffc701f7000)
	libavdevice.so.58 => ../lib/libavdevice.so.58 (0x00007f0f70b9c000)
	libavfilter.so.7 => ../lib/libavfilter.so.7 (0x00007f0f7068f000)
	libavformat.so.58 => ../lib/libavformat.so.58 (0x00007f0f70233000)
	libavcodec.so.58 => ../lib/libavcodec.so.58 (0x00007f0f6eb0b000)
	libswresample.so.3 => ../lib/libswresample.so.3 (0x00007f0f6e8ee000)
	libswscale.so.5 => ../lib/libswscale.so.5 (0x00007f0f6e663000)
	libavutil.so.56 => ../lib/libavutil.so.56 (0x00007f0f6e23e000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f0f6dea0000)
	libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f0f6dc81000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f0f6d890000)
	libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f0f6d668000)
	libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007f0f6d465000)
	libxcb-shape.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007f0f6d261000)
	libxcb-xfixes.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007f0f6d059000)
	libasound.so.2 => /usr/lib/x86_64-linux-gnu/libasound.so.2 (0x00007f0f6cd52000)
	libva.so.2 => /usr/lib/x86_64-linux-gnu/libva.so.2 (0x00007f0f6cb31000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f0f6c914000)
	libva-drm.so.2 => /usr/lib/x86_64-linux-gnu/libva-drm.so.2 (0x00007f0f6c711000)
	libvdpau.so.1 => /usr/lib/x86_64-linux-gnu/libvdpau.so.1 (0x00007f0f6c50d000)
	libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007f0f6c1d5000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f0f70ff2000)
	libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f0f6bfd1000)
	libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f0f6bdcb000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f0f6bbc7000)
	librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f0f6b9bf000)
	libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 (0x00007f0f6b7ae000)
	libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007f0f6b59c000)
	libbsd.so.0 => /lib/x86_64-linux-gnu/libbsd.so.0 (0x00007f0f6b387000)

然后再去运行bin目录下的ffmpeg可执行文件

$ ./ffmpeg 
ffmpeg version N-95621-g53c21c2d6b Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.4.0-1ubuntu1~18.04.1)
  configuration: --prefix=/home/zoctopus/sofoware/ffmpeg-src/ffmpeg_install --enable-shared --disable-static --disable-doc
  libavutil      56. 35.101 / 56. 35.101
  libavcodec     58. 60.100 / 58. 60.100
  libavformat    58. 33.100 / 58. 33.100
  libavdevice    58.  9.100 / 58.  9.100
  libavfilter     7. 66.100 /  7. 66.100
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

默认文件位置：

默认安装在/user/local文件下，其中：

头文件在/usr/local/include目录下
编译好的libs放在/usr/local/lib目录下
可执行文件放在/usr/local/bin目录下(ffmpeg、ffprobe、ffserver)
文档放在/usr/local/share/man/man1目录下

参考文章

ubuntu 编译安装ffmpeg