Post date: Jan 01, 2015 8:28:50 PM
The following tutorial shows how to build ffmpeg for Android in Windows. It is based on the tutorial in [1], which is meant for unix system, and adjusts approriately for the Windows/Cygwin build platform.
1. Download ffmpeg, edit the configure file as follows
SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'
#: ${TMPDIR:=$TEMPDIR}
#: ${TMPDIR:=$TMP}
: ${TMPDIR:=C:/cygwin64/tmp}
2. Remove ^M in version.sh using the following command
cp configure version.sh.bak
tr -cd '\11\12\40-\176' <version.sh.bak >version.sh
3. Create an build_android.sh with the following content.
#!/bin/bash
NDK=C:/NVPACK/android-ndk-r9d/
SYSROOT=$NDK/platforms/android-9/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/windows
function build_one
{
./configure \
--prefix=C:/NVPACK/android-ndk-r9d/sources/ffmpeg/android/arm \
--enable-shared \
--disable-static \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-avdevice \
--disable-doc \
--disable-symver \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
--target-os=linux \
--arch=arm \
--enable-cross-compile \
--sysroot=$SYSROOT \
--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
cp config.h config.h.bak
tr -cd '\11\12\40-\176' <config.h.bak >config.h
make clean
make
make install
}
CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"
build_one
4. Execute build_android.sh (after making it executable). The build will fail at various linking stages due to no support for Cygwin's symbolic link. This is fixed by removing the symbolic link, e.g. libavutil/libavutil.so and make a copy of the actual library, e.g. libavutil/libavutil-52.so, with the symlink name. Then type make to continue.
[1] http://www.roman10.net/how-to-build-ffmpeg-with-ndk-r9/