ios开发编译ffmpeg

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做ios平台视频监控项目，需要视频解码，所以编译ffmpeg，首先说一下自己的开发环境：

mac os x 10.8.2

xcode 4.5

ios 6.0

ffmpeg 0.9.2

步骤如下：

第一：https://github.com/yuvi/gas-preprocessor下载gas-preprocessor.pl文件并将其放置到/usr/sbin路径下，然后对其赋予权限，如下所示

1:sudo cp gas-preprocessor.pl /usr/sbin 命令行到gas-preprocessor.pl 目录，拷贝

2:cd /usr/sbin

3:sudo chmod 777 gas-preprocessor.pl

第二：到ffmpeg的官网http://ffmpeg.org/download.html下载所需要版本代码，这里选择ffmpeg0.9.2,解压之后会得到一个ffmpeg-0.9.2的文件夹

第三：从终端进入到加压出来的ffmpeg-0.9.2文件夹，并执行make clean命令，清除上次生成的库文件

第四：模拟器

./configure \--cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc \--as='gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc' \--nm="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/nm" \--sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk \--target-os=darwin \--arch=i386 \--cpu=i386 \--extra-cflags='-arch i386 -miphoneos-version-min=4.3 -mdynamic-no-pic' \--extra-ldflags='-arch i386 -miphoneos-version-min=4.3 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk' \--prefix=compiled/i386 \--enable-cross-compile \--enable-nonfree \--enable-gpl \--disable-armv5te \--disable-swscale-alpha \--disable-doc \--disable-ffmpeg \--disable-ffplay \--disable-ffprobe \--disable-ffserver \--disable-asm \--disable-debug

第五：真机

make clean./configure \--cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \--as='gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' \--sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk \--extra-ldflags=-L/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk/usr/lib/system \--target-os=darwin \--arch=arm \--cpu=cortex-a8 \--extra-cflags='-arch armv7' \--extra-ldflags='-arch armv7' \--enable-pic \--enable-cross-compile \--disable-ffmpeg \--disable-ffplay \--disable-ffserver \--disable-doc

待续，参考http://www.cnblogs.com/kiss007/archive/2012/11/08/2760086.html