diff --git a/build-ffmpeg.sh b/build-ffmpeg.sh
new file mode 100755
index 0000000000000000000000000000000000000000..6b02864a14f1e464c5af311193442a10fc19363d
--- /dev/null
+++ b/build-ffmpeg.sh
@@ -0,0 +1,195 @@
+#! /bin/sh
+
+# This script is based on projects below
+# https://github.com/yixia/FFmpeg-Android
+# http://git.videolan.org/?p=vlc-ports/android.git;a=summary
+
+#--------------------
+echo "===================="
+echo "[*] check env"
+echo "===================="
+set -e
+
+if [ -z "$ANDROID_NDK" -o -z "$ANDROID_SDK" ]; then
+    echo "You must define ANDROID_NDK, ANDROID_SDK before starting."
+    echo "They must point to your NDK and SDK directories.\n"
+    exit 1
+fi
+
+# try to detect NDK version
+FF_NDK_REL=$(grep -o '^r[0-9]*.*' $ANDROID_NDK/RELEASE.TXT 2>/dev/null|cut -b2-)
+case "$FF_NDK_REL" in
+    8?*)
+        # we don't use 4.4.3 because it doesn't handle threads correctly.
+        if test -d ${ANDROID_NDK}/toolchains/arm-linux-androideabi-4.7
+        # if gcc 4.7 is present, it's there for all the archs (x86, mips, arm)
+        then
+            echo "NDKr$FF_NDK_REL detected"
+        else
+            echo "You need the NDKv8e or later"
+            exit 1
+        fi
+    ;;
+    7|8|*)
+        echo "You need the NDKv8e or later"
+        exit 1
+    ;;
+esac
+
+FF_BUILD_ROOT=`pwd`
+FF_SOURCE=$FF_BUILD_ROOT/ffmpeg-armv7a
+FF_ANDROID_PLATFORM=android-9
+FF_GCC_VER=4.7
+
+FF_CFG_FLAGS="--target-os=linux --enable-small"
+
+FF_EXTRA_CFLAGS=
+FF_EXTRA_LDFLAGS=
+
+#----- armv7a begin -----
+FF_BUILD_NAME=ffmpeg-armv7a
+FF_CROSS_PREFIX=arm-linux-androideabi
+
+FF_CFG_FLAGS="$FF_CFG_FLAGS --arch=arm"
+FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-neon"
+FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-thumb"
+
+FF_EXTRA_CFLAGS="$FF_EXTRA_CFLAGS -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=softfp -mthumb"
+FF_EXTRA_LDFLAGS="$FF_EXTRA_LDFLAGS -Wl,--fix-cortex-a8"
+#----- armv7a end -----
+
+
+FF_TOOLCHAIN_NAME=${FF_CROSS_PREFIX}-${FF_GCC_VER}
+FF_TOOLCHAIN_PATH=$FF_BUILD_ROOT/build/$FF_BUILD_NAME/toolchain
+
+FF_SYSROOT=$FF_TOOLCHAIN_PATH/sysroot
+FF_PREFIX=$FF_BUILD_ROOT/build/$FF_BUILD_NAME/output
+
+mkdir -p $FF_PREFIX
+mkdir -p $FF_SYSROOT
+
+#--------------------
+echo "\n--------------------"
+echo "[*] make NDK standalone toolchain"
+echo "--------------------"
+UNAMES=$(uname -s)
+FF_MAKE_TOOLCHAIN_FLAGS="--install-dir=$FF_TOOLCHAIN_PATH"
+if [ "$UNAMES" == "Darwin" ]; then
+    echo "build on darwin-x86_64"
+    FF_MAKE_TOOLCHAIN_FLAGS="$FF_MAKE_TOOLCHAIN_FLAGS --system=darwin-x86_64"
+    FF_MAKE_FLAG=-j`sysctl -n machdep.cpu.thread_count`
+fi
+
+FF_MAKEFLAGS=
+if which nproc >/dev/null
+then
+    FF_MAKEFLAGS=-j`nproc`
+elif [ "$UNAMES" == "Darwin" ] && which sysctl >/dev/null
+then
+    FF_MAKEFLAGS=-j`sysctl -n machdep.cpu.thread_count`
+fi
+
+
+$ANDROID_NDK/build/tools/make-standalone-toolchain.sh \
+    $FF_MAKE_TOOLCHAIN_FLAGS \
+    --platform=$FF_ANDROID_PLATFORM \
+    --toolchain=$FF_TOOLCHAIN_NAME
+
+#--------------------
+echo "\n--------------------"
+echo "[*] check ffmpeg env"
+echo "--------------------"
+export PATH=$FF_TOOLCHAIN_PATH/bin:$PATH
+export CC="ccache ${FF_CROSS_PREFIX}-gcc"
+export LD=${FF_CROSS_PREFIX}-ld
+export AR=${FF_CROSS_PREFIX}-ar
+export STRIP=${FF_CROSS_PREFIX}-strip
+
+FF_CFLAGS="-O3 -Wall -pipe -fpic -fasm \
+    -ffast-math \
+    -fstrict-aliasing -Werror=strict-aliasing \
+    -fmodulo-sched -fmodulo-sched-allow-regmoves \
+    -Wno-psabi -Wa,--noexecstack \
+    -D__ARM_ARCH_5__ -D__ARM_ARCH_5E__ -D__ARM_ARCH_5T__ -D__ARM_ARCH_5TE__ \
+    -DANDROID -DNDEBUG"
+
+# --enable-thumb is OK
+#FF_CFLAGS="$FF_CFLAGS -mthumb"
+
+# not necessary
+#FF_CFLAGS="$FF_CFLAGS -finline-limit=300"
+
+FF_CFG_FLAGS="$FF_CFG_FLAGS \
+    --prefix=$FF_PREFIX \
+    --enable-cross-compile \
+    --cross-prefix=${FF_CROSS_PREFIX}- \
+    --enable-shared \
+    --disable-symver \
+    --disable-doc \
+    --disable-ffplay \
+    --disable-ffmpeg \
+    --disable-ffprobe \
+    --disable-ffserver \
+    --disable-avdevice \
+    --disable-avfilter \
+    --disable-encoders \
+    --disable-muxers \
+    --disable-bsfs \
+    --disable-filters \
+    --disable-devices \
+    --disable-everything \
+    --enable-protocols  \
+    --enable-parsers \
+    --enable-demuxers \
+    --disable-demuxer=sbg \
+    --enable-decoders \
+    --enable-network \
+    --enable-swscale  \
+    --enable-asm \
+    --enable-version3"
+
+echo $FF_CFG_FLAGS
+
+#--------------------
+echo "\n--------------------"
+echo "[*] configurate ffmpeg"
+echo "--------------------"
+cd $FF_SOURCE
+if [ -f "./config.h" ]; then
+    echo 'reuse configure'
+else
+    ./configure $FF_CFG_FLAGS \
+        --extra-cflags="$FF_CFLAGS $FF_EXTRA_CFLAGS" \
+        --extra-ldflags="$FF_EXTRA_LDFLAGS"
+    make clean
+fi
+
+#--------------------
+echo "\n--------------------"
+echo "[*] compile ffmpeg"
+echo "--------------------"
+cp config.* $FF_PREFIX
+make $FF_MAKEFLAGS
+make install
+
+#--------------------
+echo "\n--------------------"
+echo "[*] link ffmpeg"
+echo "--------------------"
+rm libavcodec/log2_tab.o
+rm libavutil/log2_tab.o
+rm libswresample/log2_tab.o
+$CC -lm -lz -shared --sysroot=$FF_SYSROOT -Wl,--no-undefined -Wl,-z,noexecstack $FF_EXTRA_LDFLAGS \
+    libavutil/*.o \
+    libavutil/arm/*.o \
+    libavcodec/*.o \
+    libavcodec/arm/*.o \
+    libavformat/*.o \
+    libswresample/*.o \
+    libswresample/arm/*.o \
+    libswscale/*.o \
+    -o $FF_PREFIX/libffmpeg.so
+
+cp $FF_PREFIX/libffmpeg.so $FF_PREFIX/libffmpeg-debug.so
+$STRIP --strip-unneeded $FF_PREFIX/libffmpeg.so
+