Compilation guide

1) Download the NDK from
https://developer.android.com/tools/sdk/ndk/index.html

and unpack it to your favourite folder 

2) move to the ffmpeg directory

3) change the NDK variable on the build_android.sh script and run it!


How to reproduce the repository guide

1) Clone ffmpeg and x264 from master

2) Update the configure file located inside the ffmpeg folder.

Change the following lines:

SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

with these lines:

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'


3) Create the following script inside the ffmpeg folder and execute it to generate the ffmpeg binary
   Change the path of the NDK if needed


#!/bin/bash

NDK=$HOME/android-ndk-r10d

SYSROOT=$NDK/platforms/android-9/arch-arm/

TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/linux-x86_64

function build_one

{

./configure \
    --arch=arm \
    --cpu=cortex-a8 \
    --target-os=linux \
    --enable-runtime-cpudetect \
    --enable-pic \
    --disable-shared \
    --enable-static \
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
    --enable-cross-compile \
    --sysroot=$SYSROOT \
    --extra-cflags="-I../x264 -mfloat-abi=softfp -mfpu=neon -fPIE -pie" \
    --extra-ldflags="-L../x264 -fPIE -pie" \
    --enable-version3 \
    --enable-gpl \
    \
    --disable-doc \
    --enable-yasm \
    \
    --disable-everything \
    --enable-decoder=mpeg4 \
    --enable-decoder=aac --enable-decoder=h264 \
    --enable-decoder=libx264 --enable-encoder=libx264 \
    --enable-encoder=mpeg4 \
    --enable-encoder=aac --enable-encoder=h264 \
    --enable-parser=aac --enable-parser=mpeg4video \
    --enable-parser=ac3 --enable-parser=h261 \
    --enable-parser=h264 --enable-parser=vc1 \
    --enable-demuxer=mpegvideo --enable-demuxer=aac \
    --enable-demuxer=m4v --enable-demuxer=mov \
    --enable-demuxer=h264 --enable-demuxer=vc1 \
    --enable-muxer=h264 --enable-muxer=mpeg2video \
    --enable-muxer=mp4 --enable-muxer=mov \
    --enable-protocol=file \
    --enable-indev=v4l --enable-indev=v4l2 \
    --enable-filter=aresample \
    \
    --disable-indevs \
    --enable-indev=lavfi \
    --disable-outdevs \
    \
    --enable-hwaccels \
    \
    --enable-ffmpeg \
    --disable-ffplay \
    --disable-ffprobe \
    --disable-ffserver \
    --disable-symver \
    --disable-network \
    \
    --enable-libx264 \
    --enable-zlib \
    --enable-muxer=md5


    $ADDITIONAL_CONFIGURE_FLAG

make clean

make


}

PREFIX=$(pwd)/android/$CPU 

build_one