FFmpeg在iOS上完美编译
原文 http://www.cocoachina.com/ios/20150514/11827.html
最近刚接触ffmpeg,找了很多相关的编译资料,都没有编译成功,前几天在 github上找到一个脚本( https://github.com/kewlbear/FFmpeg-iOS-build-script ),就可完美编译
准备条件
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先下载文件: https://github.com/libav/gas-preprocessor ,
复制gas-preprocessor.pl到/usr/sbin下,
修改文件权限:chmod 777 /usr/local/bin/gas-preprocessor.pl
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安装yasm
具体步骤如下:
1. 下载脚本: https://github.com/kewlbear/FFmpeg-iOS-build-script
2. 解压,找到文件 build-ffmpeg.sh
3. 执行服本文件:./build-ffmpeg.sh, 由于本人没有事先安装Yasm 执行脚本文件会出错,
如下:
MAC:FFmpeg-iOS-build-script-master-2 jinsonglnan$ ./build-ffmpeg.sh Yasm not found Homebrew not found. Trying to install... Whoops, the Homebrew installer has moved! Please instead run: ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" Also, please ask wherever you got this link from to update it to the above. Trying to install Yasm... ./build-ffmpeg.sh: line 67: brew: command not found
意思就是说,没有yasm, 看到提示执行 ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"安装
4.编译完成后,终端进入FFmpeg-iOS-build-script目录,然后输入./build-ffmpeg.sh lipo,这个命令是讲.a文件合并成一个
5.把ffmpeg-iOS文件加入到工程中
6.添加一个头文件引用 #include "avformat.h"
添加一个api语句:av_register_all();给一个类文件.m后缀改为.mm,开启混编模式。
运行工程,如果没有报错,则表明编译成功
7.其他注意细节
编译的时候报错: 'libavcodec/avcodec.h' file not found ,修改Header search paths 里的路径:$(PROJECT_DIR)/FFmpeg-iOS/include
加入External libraries:
libz.dylib libbz2.dylib libiconv.dylib
8.编译好,写了个demo: 点此下载