裁剪ffmpeg2.7.2，支持H264以及Udp（大小在1M左右，已验证可用）

#!/bin/bash
NDK=/home/ubuntu/Downloads/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 \
--prefix=$PREFIX \
--disable-yasm \
--disable-static \
--enable-shared \
--disable-decoders \
--enable-decoder=h264 \
--disable-encoders \
--disable-muxers \
--disable-demuxers \
--enable-demuxer=h264 \
--disable-protocols \
--enable-protocol=file \
--enable-protocol=udp \
--disable-filters \
--disable-parsers \
--enable-parser=h264 \
--disable-bsfs \
--disable-indevs \
--disable-outdevs \
--disable-w32threads \
--enable-network \
--disable-postproc \
--disable-pthreads \
--disable-dwt \
--disable-lsp \
--disable-lzo \
--disable-mdct \
--disable-rdft \
--disable-fft \
--disable-ffplay \
--disable-ffprobe \
--disable-ffserver \
--disable-memalign-hack \
--enable-cross-compile \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
--target-os=linux \
--arch=arm \
--sysroot=$SYSROOT \
--extra-cflags="-Os -fpic $ADDI_CFLAGS" \
--extra-ldflags="$ADDI_LDFLAGS" \
$ADDITIONAL_CONFIGURE_FLAG
}
CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"
build_one