this is how i compiled ffmpeg this might help someone, here are steps to build ffmpeg for IOS5
1. i download the ffmpeg4ios.
2. enabled required coders/decoders in build_armv7
if you know which one is to be enable then enable them, otherwise just use the following code in build-armv7. it will enable all encoders and decoders..
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#!/bin/tcsh -f
if (! -d armv7) mkdir armv7
if (! -d lib) mkdir lib
rm armv7/*.a
make clean
./configure –enable-cross-compile –arch=arm –target-os=darwin –cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc –as=’gas-preprocessor/gas-preprocessor.pl /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc’ –sysroot=/Developer/Platforms/iPhoneOS.platform/ Developer/SDKs/iPhoneOS5.0.sdk –cpu=cortex-a8 –extra-cflags=’-arch armv7′ –extra-ldflags=’-arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk’ –enable-pic
make
mv libavcodec/libavcodec.a armv7/
mv libavdevice/libavdevice.a armv7/
mv libavformat/libavformat.a armv7/
mv libavutil/libavutil.a armv7/
mv libswscale/libswscale.a armv7/
rm lib/*.a
cp armv7/*.a lib/
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3. and now run the ./configure –disable-yasm from where it placed
4. now open config.h file and check weather required things are enabled or not, if not once check build-armv7 and change required things and goto step 3
5. and than run ./build_armv7
here i faced some problems like
***
CC libavformat/asfcrypt.o error: invalid operand in inline asm: 'ldr ${0:Q}, $1 ldr ${0:R}, $2 ' than i comment a line in libavutil/arm/intmath.h i.e,
#define av_clipl_int32 av_clipl_int32_arm***
if it says install gas-preprocessor.pl just download it from here
now give all permissions to the file(i,e 777) and move the file to /usr/local/bin
here you can find source code which help you using this static libraries build from ffmpeg
NOTE: while you are trying to open a local file if av_open_input_file() returns -2 make sure enable file protocol. just open config.h file there you can find what are enabled. and we need to call av_register_all() before opening file,
if anything i missed please write comment(top right of the post) here ……..
iPhone Developer 