Compile FFMPEG in iOS with bitcode mode - ios

Question

I compiled FFMPEG libs which supports for iOS 7 and 8 but since recent release with iOS 9 there is a new feature has issued which called bitcode mode , as a default setting , this setting has set to NO .
But if i set this as yes , following error will execute ,
libavdevice.a(avfoundation.o)' does not contain bitcode. You must rebuild it with bitcode enabled (Xcode setting ENABLE_BITCODE), obtain an updated library from the vendor, or disable bitcode for this target. for architecture arm64
Is there any way to compile FFMPEG which supports FFMpeg in bitcode enabled mode
here is the build script i used
#!/bin/sh
# directories
SOURCE="ffmpeg-2.6.2"
FAT="FFmpeg-iOS"
SCRATCH="scratch"
# must be an absolute path
THIN=`pwd`/"thin"
# absolute path to x264 library
#X264=`pwd`/fat-x264
#FDK_AAC=`pwd`/fdk-aac/fdk-aac-ios
CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs \
--disable-doc --enable-pic"
if [ "$X264" ]
then
CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-gpl --enable-libx264"
fi
if [ "$FDK_AAC" ]
then
CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-libfdk-aac"
fi
# avresample
#CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-avresample"
ARCHS="arm64 armv7 x86_64 i386"
COMPILE="y"
LIPO="y"
DEPLOYMENT_TARGET="6.0"
if [ "$*" ]
then
if [ "$*" = "lipo" ]
then
# skip compile
COMPILE=
else
ARCHS="$*"
if [ $# -eq 1 ]
then
# skip lipo
LIPO=
fi
fi
fi
if [ "$COMPILE" ]
then
if [ ! `which yasm` ]
then
echo 'Yasm not found'
if [ ! `which brew` ]
then
echo 'Homebrew not found. Trying to install...'
ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)" \
|| exit 1
fi
echo 'Trying to install Yasm...'
brew install yasm || exit 1
fi
if [ ! `which gas-preprocessor.pl` ]
then
echo 'gas-preprocessor.pl not found. Trying to install...'
(curl -L https://github.com/libav/gas-preprocessor/raw/master/gas-preprocessor.pl \
-o /usr/local/bin/gas-preprocessor.pl \
&& chmod +x /usr/local/bin/gas-preprocessor.pl) \
|| exit 1
fi
if [ ! -r $SOURCE ]
then
echo 'FFmpeg source not found. Trying to download...'
curl http://www.ffmpeg.org/releases/$SOURCE.tar.bz2 | tar xj \
|| exit 1
fi
CWD=`pwd`
for ARCH in $ARCHS
do
echo "building $ARCH..."
mkdir -p "$SCRATCH/$ARCH"
cd "$SCRATCH/$ARCH"
CFLAGS="-arch $ARCH"
if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
then
PLATFORM="iPhoneSimulator"
CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"
else
PLATFORM="iPhoneOS"
CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET"
if [ "$ARCH" = "arm64" ]
then
EXPORT="GASPP_FIX_XCODE5=1"
fi
fi
XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
CC="xcrun -sdk $XCRUN_SDK clang"
CXXFLAGS="$CFLAGS"
LDFLAGS="$CFLAGS"
if [ "$X264" ]
then
CFLAGS="$CFLAGS -I$X264/include"
LDFLAGS="$LDFLAGS -L$X264/lib"
fi
if [ "$FDK_AAC" ]
then
CFLAGS="$CFLAGS -I$FDK_AAC/include"
LDFLAGS="$LDFLAGS -L$FDK_AAC/lib"
fi
TMPDIR=${TMPDIR/%\/} $CWD/$SOURCE/configure \
--target-os=darwin \
--arch=$ARCH \
--cc="$CC" \
$CONFIGURE_FLAGS \
--extra-cflags="$CFLAGS" \
--extra-cxxflags="$CXXFLAGS" \
--extra-ldflags="$LDFLAGS" \
--prefix="$THIN/$ARCH" \
|| exit 1
make -j3 install $EXPORT || exit 1
cd $CWD
done
fi
if [ "$LIPO" ]
then
echo "building fat binaries..."
mkdir -p $FAT/lib
set - $ARCHS
CWD=`pwd`
cd $THIN/$1/lib
for LIB in *.a
do
cd $CWD
echo lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB 1>&2
lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB || exit 1
done
cd $CWD
cp -rf $THIN/$1/include $FAT
fi
echo Done

Answer 1

I got it working using the following CONFIGURE_FLAGS:
CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs \
--disable-doc --enable-pic \
--extra-cflags=-fembed-bitcode --extra-cxxflags=-fembed-bitcode"
If you only need to decode videos, you should add more flags to disable all muxers,encoders. You'll also probably don't need filters. This will save some space. I also disabled the ARCH i386, which is not needed for the iOS simulator.
I use these flags for my project:
CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs \
--disable-doc --enable-pic \
--extra-cflags=-fembed-bitcode --extra-cxxflags=-fembed-bitcode \
--enable-nonfree --enable-gpl \
--disable-ffserver --disable-ffmpeg --disable-ffprobe \
--disable-avdevice --disable-avfilter --disable-encoders \
--disable-parsers --disable-decoders --disable-protocols \
--disable-filters --disable-muxers --disable-bsfs \
--disable-indevs --disable-outdevs --disable-demuxers \
--enable-protocol=file \
--enable-protocol=tcp \
--enable-protocol=udp \
--enable-decoder=msmpeg4v3 \
--enable-decoder=mpeg4 \
--enable-decoder=mjpeg \
--enable-decoder=h264 \
--enable-parser=mpeg4video \
--enable-parser=mjpeg \
--enable-parser=h263 \
--enable-parser=h264 \
--enable-parser=aac \
--enable-demuxer=avi \
--enable-demuxer=mov \
--enable-demuxer=rtsp \
"

Answer 2

Add -fembed-bitcode-marker to CONFIGURE_FLAGS
like this:
CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs \
--disable-doc --enable-pic -fembed-bitcode-marker"