Linux编译ffmpeg

下载:
http://ffmpeg.org/download.html

编译:(更多参数见./configure --help)：最终编译完成后位于/usr/local/ffmpeg下

cd ffmpeg
#可选参数  --disable-static --enable-shared :默认配置是生成静态链接库so,添加此配置即生成动态库
 ./configure  --prefix=/usr/local/ffmpeg --enable-debug=3
make -j 4
make install

编译出现的错误:
gcc is unable to create an executable file.
If gcc is a cross-compiler, use the --enable-cross-compile option.
Only do this if you know what cross compiling means.
C compiler test failed.

//未安装gcc：
sudo apt-get install gcc

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

If you think configure made a mistake, make sure you are using the latest
version from Git. If the latest version fails, report the problem to the
ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "ffbuild/config.log" produced by configure as this will help
solve the problem.

//yasm是汇编编译器，ffmpeg为了提高效率使用了汇编指令，如MMX和SSE等。所以系统中未安装yasm
sudo apt install yasm

缺少make:

sudo apt install make

在home或者etc目录下的.profile文件中进行环境配置:
配置path:

export PATH=$PATH:/usr/local/ffmpeg/bin

配置pkg_config_path：

export PKG_CONFIG_PATH=/usr/local/ffmpeg/lib/pkgconfig

配置完成后要source .profile生效配置：具体可以通过echo $PATH查看是否生效，pkg同理。

make install完成后就会在指定目录生成编译后资源(/usr/local/ffmpeg)

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