转自：http://blog.csdn.net/ixfly/article/details/7621258
首先到http://www.videolan.org/developers/x264.html下载x264的库，然后解压。
打开shell，进入x264的目录，执行如下语句
CC=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc ./configure --host=arm-apple-darwin --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk --prefix='dist'
--extra-cflags='-arch armv7' --extra-ldflags='-arch armv7 -L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/system' --enable-pic
然后make，libx264.a就出来啦。如果无法执行，请将语句中的5.0.sdk替换成你电脑里面有的sdk。