[FFmpeg-devel] [HOWTO] Building FFmpeg for iPhone

I am pleased to announce that FFmpeg can now be built unpatched for

the iPhone.  The process is still not entirely without pain, however.

Here's how it's done:



1.  Download and install the iPhone SDK 3.1.

2.  Get the latest gas-preprocessor and install it in /usr/local/bin

    or some other directory in your $PATH.

    http://github.com/yuvi/gas-preprocessor/
 

3.  Get the latest FFmpeg from SVN (minimum r20151).

4.  Configure FFmpeg with one of the following commands.  These give a

    clean build with a default installation of iPhone SDK 3.1 on OSX Leopard.

    Other versions may vary.

4a. For iPhone 3GS or iPod Touch 3G 32GB/64GB, use this command:

    ./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.sdk --enable-cross-compile --target-os=darwin --arch=arm --cpu=cortex-a8 --enable-pic

4b. For other iPhone or iPod Touch models, use this command:

    ./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin9-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS3.1.sdk --enable-cross-compile --target-os=darwin --arch=arm --cpu=arm1176jzf-s

5.  Run make.



It is important to specify a correct --cpu option, and not merely an

architecture version.  Failure to specify the exact CPU will give a

broken build.



For the iPhone 3GS and compatible iPods, --enable-pic is required to

avoid some nasty-looking linker warnings about relocations.



I have not tested the builds on an iPhone/iPod, so there may still be

remaining issues.  Please report any problems you encounter.



Many thanks to David Conrad for the gas-preprocessor script, without

which this would not be possible.



-- 

Måns Rullgård

mans at mansr.com












http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html

http://github.com/lajos/iFrameExtractor



./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk --enable-cross-compile --target-os=darwin --arch=arm --cpu=cortex-a8 --enable-pic



./configure --cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1 --as='gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/arm-apple-darwin10-gcc-4.2.1' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk --enable-cross-compile --target-os=darwin --arch=arm --cpu=arm1176jzf-s



lipo -create -arch armv6 6/libavcodec.a -arch armv7 7/libavcodec.a -output all/libavcodec.a

lipo -create -arch armv6 6/libavdevice.a -arch armv7 7/libavdevice.a -output all/libavdevice.a

lipo -create -arch armv6 6/libavformat.a -arch armv7 7/libavformat.a -output all/libavformat.a

lipo -create -arch armv6 6/libavutil.a -arch armv7 7/libavutil.a -output all/libavutil.a

lipo -create -arch armv6 6/libswscale.a -arch armv7 7/libswscale.a -output all/libswscale.a