一.下载FFmpeg安装文件
下载的文件，包含 build-ffmpeg-iOS-framework.sh，build-ffmpeg-tvos.sh，build-ffmpeg.sh三个脚本。
二.编译FFmpeg
切换到FFmpeg-iOS-build-script-master目录，编译armv7，x86_64库
./build-ffmpeg.sh armv7 x86_64
gas-preprocessor.pl not found. Trying to install...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 43674 100 43674 0 0 19688 0 0:00:02 0:00:02 --:--:-- 39667
FFmpeg source not found. Trying to download...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10.7M 100 10.7M 0 0 72184 0 0:02:36 0:02:36 --:--:-- 84227
building armv7...
xcrun -sdk iphoneos clang is unable to create an executable file.
C compiler test failed.
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.
使用
xx@localhost FFmpeg-iOS-build-script-master % sudo xcode-select --switch /Applications/Xcode.app
配置clang编译器，重新编译即可生成armv7，x86_64库。
同理：可生成arm64，x86_64的库。
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三.编译生成头文件及库
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