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From http://code.google.com/p/siphon/wiki/VIdeoSupport 

Introduction

Currently, pjsip 2.0 includes the video support, also we will use it. And we won't backport video support in pjsip 1.x branch.

We use three external libraries :

• libyuv
• ffmpeg
• libx264
• libvpx (optional)

The statements to compile libyuv are described in this site. Maybe your svn version is too old, in this case you can update svn by following the statements of Jason McCreary's blog.

The statements to compile ffmpeg and x264 libraries are given on this site.

Some statements to include VP8 support in pjsip are given on this page.

libx264 compilation

#!/bin/sh
DEST=../iOS/video/iOS
VERSION="5.1"
SDK_VERSION="5.1"
DEVPATH=/Applications/XCode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer
#DEVPATH=/Developer/Platforms/iPhoneOS.platform/Developer
echo "Building armv7..."
export CC=${DEVPATH}/usr/bin/llvm-gcc
./configure --host=arm-apple-darwin \
    --sysroot=${DEVPATH}/SDKs/iPhoneOS${VERSION}.sdk \
    --prefix=$DEST \
    --extra-cflags='-arch armv7' \
    --extra-ldflags="-L${DEVPATH}/SDKs/iPhoneOS${SDK_VERSION}.sdk/usr/lib/system -arch armv7" \
    --enable-pic \
    --enable-static
make && make install
echo "Installed: $DEST"

ffmpeg compilation

#!/bin/sh
DEST=../iOS/video/iOS
VERSION=5.1
IPHONEOS_DEPLOYMENT_TARGET=5.1  
DEVPATH=/Applications/XCode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer
#DEVPATH=/Developer/Platforms/iPhoneOS.platform/Developer
X264INCLUDE=${DEST}/include
X264LIB=${DEST}/lib
COMMONFLAGS="-miphoneos-version-min=$IPHONEOS_DEPLOYMENT_TARGET -arch armv7 "
CFLAGS="$CFLAGS $COMMONFLAGS -I$X264INCLUDE"
LDFLAGS="$LDFLAGS -L${DEVPATH}/SDKs/iPhoneOS${VERSION}.sdk/usr/lib/system $COMMONFLAGS -L$X264LIB"
export CC=${DEVPATH}/usr/bin/llvm-gcc
export RANLIB=${DEVPATH}/usr/bin/ranlib
echo "Building armv7..."
./configure \
    --cpu=cortex-a8 \
    --extra-cflags="$CFLAGS" \
    --extra-ldflags="$LDFLAGS" \
    --enable-cross-compile \
    --arch=arm \
    --target-os=darwin \
    --cc=${CC} \
    --sysroot=${DEVPATH}/SDKs/iPhoneOS${VERSION}.sdk \
    --prefix=${DEST} \
    --enable-gpl \
    --disable-network \
    --disable-decoders \
    --disable-muxers \
    --disable-demuxers \
    --disable-devices \
    --disable-parsers \
    --disable-encoders \
    --disable-protocols \
    --disable-filters \
    --disable-bsfs \
    --enable-libx264 \
    --enable-encoder=libx264 \
    --enable-encoder=libx264rgb \
    --enable-decoder=h264 \
    --enable-encoder=h263 \
    --enable-decoder=h263 \
    --enable-gpl \
    --enable-pic \
    --disable-doc \
    --disable-ffplay \
    --disable-ffprobe
   
make & make install
echo "Installed: $DEST"

vpx compilation

#!/bin/sh
DEST=../iOS/video/iOS
VERSION=6.0
DEVPATH=/Applications/XCode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer
mkdir armv7_build
cd armv7_build
../configure --target=armv7-darwin-gcc \
     --prefix=${DEST} \
     --disable-install-bins \
     --libc=${DEVPATH}/SDKs/iPhoneOS${VERSION}.sdk
make & make install

pjsip compilation

You have to enable video support in config_site.h:

#define PJMEDIA_HAS_VIDEO 1

iOS

./configure-iphone --prefix=./iOS --with-ffmpeg=../iOS/video/iOS
make & make install

Simulator

export ARCH="-arch i386"
export DEVPATH=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer
export IPHONESDK=iPhoneSimulator6.0.sdk
export CC=${DEVPATH}/usr/bin/llvm-gcc
export CFLAGS="-O2 -m32 -miphoneos-version-min=5.0 -fobjc-abi-version=2 -fobjc-legacy-dispatch"
export LDFLAGS="-O2 -m32"
./configure-iphone --prefix=./Simulator --with-ffmpeg=../iOS/video/iOS
make & make install

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