README.markdown

original copyright

This project extracts frames from video recorded by iPhone 3Gs using the LGPL FFmpeg libraries.

This software is licensed under the GNU-LGPL version 2.1 or later.

Copyright 2010 Lajos Kamocsay

lajos at codza dot com

Introduction

This project is forked from https://github.com/lajos/iFrameExtractor. I update the code for the latest ffmpeg and iOS version. The source code is tested on Mac OS 10.7.4(Lion) for ffmpeg 0.11.1 and iOS 5.1 with Xcode 4.3.2.

Build steps

• Download the code using

git clone git://github.com/PinkyJie/iFrameExtractor.git

• Download the latest ffmpeg (0.11.1 tested) using

git clone git://source.ffmpeg.org/ffmpeg.git

• Put the ffmpeg source code into the folder ffmpeg

• Copy the perl script gas-preprocessor.pl into /usr/local/bin folder

• Change directory to your ffmpeg folder, select your target platform and follow the scripts below

Platforms

• armv7 (for iPhone 3GS and devices after 3GS)

configure

./configure \

--cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \

--as='/usr/local/bin/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/iPhoneOS5.1.sdk \

--target-os=darwin \

--arch=arm \

--cpu=cortex-a8 \

--extra-cflags='-arch armv7' \

--extra-ldflags='-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' \

--prefix=compiled/armv7 \

--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

make

make clean

make && make install

• armv6 (for devices before 3GS)

configure

./configure \

--cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \

--as='/usr/local/bin/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/iPhoneOS5.1.sdk \

--target-os=darwin \

--arch=arm \

--cpu=arm1176jzf-s \

--extra-cflags='-arch armv6' \

--extra-ldflags='-arch armv6 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk' \

--prefix=compiled/armv6 \

--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

make

make clean

make && make install

• i386 (for simulator)

configure

./configure \

--cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc \

--as='/usr/local/bin/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc' \

--sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk \

--target-os=darwin \

--arch=i386 \

--cpu=i386 \

--extra-cflags='-arch i386' \

--extra-ldflags='-arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.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

make

make clean

make && make install

• universal (using one *.a files for all platforms)

mkdir -p ./compiled/fat/lib

lipo -output ./compiled/fat/lib/libavcodec.a -create \

-arch armv6 ./compiled/armv6/lib/libavcodec.a \

-arch armv7 ./compiled/armv7/lib/libavcodec.a \

-arch i386 ./compiled/i386/lib/libavcodec.a

lipo -output ./compiled/fat/lib/libavdevice.a -create \

-arch armv6 ./compiled/armv6/lib/libavdevice.a \

-arch armv7 ./compiled/armv7/lib/libavdevice.a \

-arch i386 ./compiled/i386/lib/libavdevice.a

lipo -output ./compiled/fat/lib/libavformat.a -create \

-arch armv6 ./compiled/armv6/lib/libavformat.a \

-arch armv7 ./compiled/armv7/lib/libavformat.a \

-arch i386 ./compiled/i386/lib/libavformat.a

lipo -output ./compiled/fat/lib/libavutil.a -create \

-arch armv6 ./compiled/armv6/lib/libavutil.a \

-arch armv7 ./compiled/armv7/lib/libavutil.a \

-arch i386 ./compiled/i386/lib/libavutil.a

lipo -output ./compiled/fat/lib/libswresample.a -create \

-arch armv6 ./compiled/armv6/lib/libswresample.a \

-arch armv7 ./compiled/armv7/lib/libswresample.a \

-arch i386 ./compiled/i386/lib/libswresample.a

lipo -output ./compiled/fat/lib/libpostproc.a -create \

-arch armv6 ./compiled/armv6/lib/libpostproc.a \

-arch armv7 ./compiled/armv7/lib/libpostproc.a \

-arch i386 ./compiled/i386/lib/libpostproc.a

lipo -output ./compiled/fat/lib/libswscale.a -create \

-arch armv6 ./compiled/armv6/lib/libswscale.a \

-arch armv7 ./compiled/armv7/lib/libswscale.a \

-arch i386 ./compiled/i386/lib/libswscale.a

lipo -output ./compiled/fat/lib/libavfilter.a -create \

-arch armv6 ./compiled/armv6/lib/libavfilter.a \

-arch armv7 ./compiled/armv7/lib/libavfilter.a \

-arch i386 ./compiled/i386/lib/libavfilter.a

The complied static libraries (*.a) lie in theffmpeg/compiled folder.