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To configure ffmpeg for the iPhone 3gs and iPod touch 3g: ./configure --enable-cross-compile --arch=arm --target-os=darwin --cc='/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc -arch armv7' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk --cpu=cortex-a8 --enable-pic To configure ffmpeg for all other iPhones and iPods: ./configure --enable-cross-compile --arch=arm --target-os=darwin --cc='/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc -arch armv6' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.0.sdk --cpu=arm1176jzf-s Make sure to replace the iPhone SDK version with the version that you're using. Pre-3.0 versions aren't supported and probably won't work. If deploying to all generations, it's recommended to do separate out-of-tree builds for each architecture, then lipo together the resulting libs. For instance, assuming separate builds in armv6 and armv7: lipo -create -arch armv6 armv6/libavcodec/libavcodec.a -arch armv7 armv7/libavcodec/libavcodec.a -output universal/libavcodec.a and similar for each library. Then in XCode, make sure to build for both armv6 and armv7. If you only care about one generation (since the armv6 devices are too slow for instance), then lipo is unnecessary of course. Note current version in original repository contains some issue in handling nested .irpc and .if directives. The straight result is that you can hear noises in decoding mp3 through ffmpeg. I fixed this by re-arrange codes but I just made too many changes to merge it back. - Holly Lee