[原]如何用Android NDK编译FFmpeg

我们知道在Ubuntu下直接编译FFmpeg是很简单的，主要是先执行./configure，接着执行make命令来编译，完了紧接着执行make install执行安装。那么如何使用Android的NDK编译出来可以在Android下面可以使用的FFmpeg动态链接库呢？写下这篇文章就是学习如何裁剪并且编译出来可以使用的动态库。

一、获取FFmpeg源码：

　　首先在编译之前，得获取一份FFmpeg的源码，如果你没有git并且也不打算使用，你可以去FFmpeg官网http://ffmpeg.org/去下载Zip包。你也可以使用git来获取源码：

 git clone https://github.com/FFmpeg/FFmpeg.git ffmpeg

 git reset --hard

 git clean -f -d

 git checkout -B stable 2.3.

二、了解FFmpeg中configure选项：

执行./configure --help可以得到如下选项：

Usage: configure [options]

Options: [defaults in brackets after descriptions]

Help options:

  --help                   print this message

  --list-decoders          show all available decoders

  --list-encoders          show all available encoders

  --list-hwaccels          show all available hardware accelerators

  --list-demuxers          show all available demuxers

  --list-muxers            show all available muxers

  --list-parsers           show all available parsers

  --list-protocols         show all available protocols

  --list-bsfs              show all available bitstream filters

  --list-indevs            show all available input devices

  --list-outdevs           show all available output devices

  --list-filters           show all available filters

Standard options:

  --logfile=FILE           log tests and output to FILE [config.log]

  --disable-logging        do not log configure debug information

  --fatal-warnings         fail if any configure warning is generated

  --prefix=PREFIX          install in PREFIX []

  --bindir=DIR             install binaries in DIR [PREFIX/bin]

  --datadir=DIR            install data files in DIR [PREFIX/share/ffmpeg]

  --docdir=DIR             install documentation in DIR [PREFIX/share/doc/ffmpeg]

  --libdir=DIR             install libs in DIR [PREFIX/lib]

  --shlibdir=DIR           install shared libs in DIR [PREFIX/lib]

  --incdir=DIR             install includes in DIR [PREFIX/include]

  --mandir=DIR             install man page in DIR [PREFIX/share/man]

  --enable-rpath           use rpath to allow installing libraries in paths

                           not part of the dynamic linker search path

Licensing options:

  --enable-gpl             allow use of GPL code, the resulting libs

                           and binaries will be under GPL [no]

  --enable-version3        upgrade (L)GPL to version  [no]

  --enable-nonfree         allow use of nonfree code, the resulting libs

                           and binaries will be unredistributable [no]

Configuration options:

  --disable-static         do not build static libraries [no]

  --enable-shared          build shared libraries [no]

  --enable-small           optimize for size instead of speed

  --disable-runtime-cpudetect disable detecting cpu capabilities at runtime (smaller binary)

  --enable-gray            enable full grayscale support (slower color)

  --disable-swscale-alpha  disable alpha channel support in swscale

  --disable-all            disable building components, libraries and programs

  --enable-incompatible-libav-abi enable incompatible Libav fork ABI [no]

  --enable-raise-major     increase major version numbers in sonames [no]

Program options:

  --disable-programs       do not build command line programs

  --disable-ffmpeg         disable ffmpeg build

  --disable-ffplay         disable ffplay build

  --disable-ffprobe        disable ffprobe build

  --disable-ffserver       disable ffserver build

Documentation options:

  --disable-doc            do not build documentation

  --disable-htmlpages      do not build HTML documentation pages

  --disable-manpages       do not build man documentation pages

  --disable-podpages       do not build POD documentation pages

  --disable-txtpages       do not build text documentation pages

Component options:

  --disable-avdevice       disable libavdevice build

  --disable-avcodec        disable libavcodec build

  --disable-avformat       disable libavformat build

  --disable-avutil         disable libavutil build

  --disable-swresample     disable libswresample build

  --disable-swscale        disable libswscale build

  --disable-postproc       disable libpostproc build

  --disable-avfilter       disable libavfilter build

  --enable-avresample      enable libavresample build [no]

  --disable-pthreads       disable pthreads [auto]

  --disable-w32threads     disable Win32 threads [auto]

  --disable-os2threads     disable OS/ threads [auto]

  --disable-network        disable network support [no]

  --disable-dct            disable DCT code

  --disable-dwt            disable DWT code

  --disable-error-resilience disable error resilience code

  --disable-lsp            disable LSP code

  --disable-lzo            disable LZO decoder code

  --disable-mdct           disable MDCT code

  --disable-rdft           disable RDFT code

  --disable-fft            disable FFT code

Hardware accelerators:

  --disable-dxva2          disable DXVA2 code [autodetect]

  --disable-vaapi          disable VAAPI code [autodetect]

  --disable-vda            disable VDA code [autodetect]

  --disable-vdpau          disable VDPAU code [autodetect]

Individual component options:

  --disable-everything     disable all components listed below

  --disable-encoder=NAME   disable encoder NAME

  --enable-encoder=NAME    enable encoder NAME

  --disable-encoders       disable all encoders

  --disable-decoder=NAME   disable decoder NAME

  --enable-decoder=NAME    enable decoder NAME

  --disable-decoders       disable all decoders

  --disable-hwaccel=NAME   disable hwaccel NAME

  --enable-hwaccel=NAME    enable hwaccel NAME

  --disable-hwaccels       disable all hwaccels

  --disable-muxer=NAME     disable muxer NAME

  --enable-muxer=NAME      enable muxer NAME

  --disable-muxers         disable all muxers

  --disable-demuxer=NAME   disable demuxer NAME

  --enable-demuxer=NAME    enable demuxer NAME

  --disable-demuxers       disable all demuxers

  --enable-parser=NAME     enable parser NAME

  --disable-parser=NAME    disable parser NAME

  --disable-parsers        disable all parsers

  --enable-bsf=NAME        enable bitstream filter NAME

  --disable-bsf=NAME       disable bitstream filter NAME

  --disable-bsfs           disable all bitstream filters

  --enable-protocol=NAME   enable protocol NAME

  --disable-protocol=NAME  disable protocol NAME

  --disable-protocols      disable all protocols

  --enable-indev=NAME      enable input device NAME

  --disable-indev=NAME     disable input device NAME

  --disable-indevs         disable input devices

  --enable-outdev=NAME     enable output device NAME

  --disable-outdev=NAME    disable output device NAME

  --disable-outdevs        disable output devices

  --disable-devices        disable all devices

  --enable-filter=NAME     enable filter NAME

  --disable-filter=NAME    disable filter NAME

  --disable-filters        disable all filters

External library support:

  --enable-avisynth        enable reading of AviSynth script files [no]

  --disable-bzlib          disable bzlib [autodetect]

  --enable-fontconfig      enable fontconfig

  --enable-frei0r          enable frei0r video filtering

  --enable-gnutls          enable gnutls [no]

  --disable-iconv          disable iconv [autodetect]

  --enable-ladspa          enable LADSPA audio filtering

  --enable-libaacplus      enable AAC+ encoding via libaacplus [no]

  --enable-libass          enable libass subtitles rendering [no]

  --enable-libbluray       enable BluRay reading using libbluray [no]

  --enable-libbs2b         enable bs2b DSP library [no]

  --enable-libcaca         enable textual display using libcaca

  --enable-libcelt         enable CELT decoding via libcelt [no]

  --enable-libcdio         enable audio CD grabbing with libcdio

  --enable-libdc1394       enable IIDC- grabbing using libdc1394

                           and libraw1394 [no]

  --enable-libfaac         enable AAC encoding via libfaac [no]

  --enable-libfdk-aac      enable AAC de/encoding via libfdk-aac [no]

  --enable-libflite        enable flite (voice synthesis) support via libflite [no]

  --enable-libfreetype     enable libfreetype [no]

  --enable-libfribidi      enable libfribidi [no]

  --enable-libgme          enable Game Music Emu via libgme [no]

  --enable-libgsm          enable GSM de/encoding via libgsm [no]

  --enable-libiec61883     enable iec61883 via libiec61883 [no]

  --enable-libilbc         enable iLBC de/encoding via libilbc [no]

  --enable-libmodplug      enable ModPlug via libmodplug [no]

  --enable-libmp3lame      enable MP3 encoding via libmp3lame [no]

  --enable-libnut          enable NUT (de)muxing via libnut,

                           native (de)muxer exists [no]

  --enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]

  --enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]

  --enable-libopencv       enable video filtering via libopencv [no]

  --enable-libopenjpeg     enable JPEG  de/encoding via OpenJPEG [no]

  --enable-libopus         enable Opus de/encoding via libopus [no]

  --enable-libpulse        enable Pulseaudio input via libpulse [no]

  --enable-libquvi         enable quvi input via libquvi [no]

  --enable-librtmp         enable RTMP[E] support via librtmp [no]

  --enable-libschroedinger enable Dirac de/encoding via libschroedinger [no]

  --enable-libshine        enable fixed-point MP3 encoding via libshine [no]

  --enable-libsmbclient    enable Samba protocol via libsmbclient [no]

  --enable-libsoxr         enable Include libsoxr resampling [no]

  --enable-libspeex        enable Speex de/encoding via libspeex [no]

  --enable-libssh          enable SFTP protocol via libssh [no]

  --enable-libstagefright-h264  enable H. decoding via libstagefright [no]

  --enable-libtheora       enable Theora encoding via libtheora [no]

  --enable-libtwolame      enable MP2 encoding via libtwolame [no]

  --enable-libutvideo      enable Ut Video encoding and decoding via libutvideo [no]

  --enable-libv4l2         enable libv4l2/v4l-utils [no]

  --enable-libvidstab      enable video stabilization using vid.stab [no]

  --enable-libvo-aacenc    enable AAC encoding via libvo-aacenc [no]

  --enable-libvo-amrwbenc  enable AMR-WB encoding via libvo-amrwbenc [no]

  --enable-libvorbis       enable Vorbis en/decoding via libvorbis,

                           native implementation exists [no]

  --enable-libvpx          enable VP8 and VP9 de/encoding via libvpx [no]

  --enable-libwavpack      enable wavpack encoding via libwavpack [no]

  --enable-libwebp         enable WebP encoding via libwebp [no]

  --enable-libx264         enable H. encoding via x264 [no]

  --enable-libx265         enable HEVC encoding via x265 [no]

  --enable-libxavs         enable AVS encoding via xavs [no]

  --enable-libxvid         enable Xvid encoding via xvidcore,

                           native MPEG-/Xvid encoder exists [no]

  --enable-libzmq          enable message passing via libzmq [no]

  --enable-libzvbi         enable teletext support via libzvbi [no]

  --enable-decklink        enable Blackmagick DeckLink output [no]

  --enable-openal          enable OpenAL 1.1 capture support [no]

  --enable-opencl          enable OpenCL code

  --enable-opengl          enable OpenGL rendering [no]

  --enable-openssl         enable openssl [no]

  --enable-x11grab         enable X11 grabbing [no]

  --disable-xlib           disable xlib [autodetect]

  --disable-zlib           disable zlib [autodetect]

Toolchain options:

  --arch=ARCH              select architecture []

  --cpu=CPU                select the minimum required CPU (affects

                           instruction selection, may crash on older CPUs)

  --cross-prefix=PREFIX    use PREFIX for compilation tools []

  --progs-suffix=SUFFIX    program name suffix []

  --enable-cross-compile   assume a cross-compiler is used

  --sysroot=PATH           root of cross-build tree

  --sysinclude=PATH        location of cross-build system headers

  --target-os=OS           compiler targets OS []

  --target-exec=CMD        command to run executables on target

  --target-path=DIR        path to view of build directory on target

  --target-samples=DIR     path to samples directory on target

  --tempprefix=PATH        force fixed dir/prefix instead of mktemp for checks

  --toolchain=NAME         set tool defaults according to NAME

  --nm=NM                  use nm tool NM [nm -g]

  --ar=AR                  use archive tool AR [ar]

  --as=AS                  use assembler AS []

  --windres=WINDRES        use windows resource compiler WINDRES [windres]

  --yasmexe=EXE            use yasm-compatible assembler EXE [yasm]

  --cc=CC                  use C compiler CC [gcc]

  --cxx=CXX                use C compiler CXX [g++]

  --dep-cc=DEPCC           use dependency generator DEPCC [gcc]

  --ld=LD                  use linker LD []

  --pkg-config=PKGCONFIG   use pkg-config tool PKGCONFIG [pkg-config]

  --pkg-config-flags=FLAGS pass additional flags to pkgconf []

  --ranlib=RANLIB          use ranlib RANLIB [ranlib]

  --doxygen=DOXYGEN        use DOXYGEN to generate API doc [doxygen]

  --host-cc=HOSTCC         use host C compiler HOSTCC

  --host-cflags=HCFLAGS    use HCFLAGS when compiling for host

  --host-cppflags=HCPPFLAGS use HCPPFLAGS when compiling for host

  --host-ld=HOSTLD         use host linker HOSTLD

  --host-ldflags=HLDFLAGS  use HLDFLAGS when linking for host

  --host-libs=HLIBS        use libs HLIBS when linking for host

  --host-os=OS             compiler host OS []

  --extra-cflags=ECFLAGS   add ECFLAGS to CFLAGS []

  --extra-cxxflags=ECFLAGS add ECFLAGS to CXXFLAGS []

  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS []

  --extra-ldexeflags=ELDFLAGS add ELDFLAGS to LDEXEFLAGS []

  --extra-libs=ELIBS       add ELIBS []

  --extra-version=STRING   version string suffix []

  --optflags=OPTFLAGS      override optimization-related compiler flags

  --build-suffix=SUFFIX    library name suffix []

  --enable-pic             build position-independent code

  --enable-thumb           compile for Thumb instruction set

  --enable-lto             use link-time optimization

Advanced options (experts only):

  --malloc-prefix=PREFIX   prefix malloc and related names with PREFIX

  --disable-symver         disable symbol versioning

  --enable-hardcoded-tables use hardcoded tables instead of runtime generation

  --disable-safe-bitstream-reader

                           disable buffer boundary checking in bitreaders

                           (faster, but may crash)

  --enable-memalign-hack   emulate memalign, interferes with memory debuggers

  --enable-sram            allow use of on-chip SRAM

  --sws-max-filter-size=N  the max filter size swscale uses []

Optimization options (experts only):

  --disable-asm            disable all assembly optimizations

  --disable-altivec        disable AltiVec optimizations

  --disable-amd3dnow       disable 3DNow! optimizations

  --disable-amd3dnowext    disable 3DNow! extended optimizations

  --disable-mmx            disable MMX optimizations

  --disable-mmxext         disable MMXEXT optimizations

  --disable-sse            disable SSE optimizations

  --disable-sse2           disable SSE2 optimizations

  --disable-sse3           disable SSE3 optimizations

  --disable-ssse3          disable SSSE3 optimizations

  --disable-sse4           disable SSE4 optimizations

  --disable-sse42          disable SSE4. optimizations

  --disable-avx            disable AVX optimizations

  --disable-xop            disable XOP optimizations

  --disable-fma3           disable FMA3 optimizations

  --disable-fma4           disable FMA4 optimizations

  --disable-avx2           disable AVX2 optimizations

  --disable-armv5te        disable armv5te optimizations

  --disable-armv6          disable armv6 optimizations

  --disable-armv6t2        disable armv6t2 optimizations

  --disable-vfp            disable VFP optimizations

  --disable-neon           disable NEON optimizations

  --disable-inline-asm     disable use of inline assembly

  --disable-yasm           disable use of nasm/yasm assembly

  --disable-mips32r2       disable MIPS32R2 optimizations

  --disable-mipsdspr1      disable MIPS DSP ASE R1 optimizations

  --disable-mipsdspr2      disable MIPS DSP ASE R2 optimizations

  --disable-mipsfpu        disable floating point MIPS optimizations

  --disable-fast-unaligned consider unaligned accesses slow

Developer options (useful when working on FFmpeg itself):

  --disable-debug          disable debugging symbols

  --enable-debug=LEVEL     set the debug level []

  --disable-optimizations  disable compiler optimizations

  --enable-extra-warnings  enable more compiler warnings

  --disable-stripping      disable stripping of executables and shared libraries

  --assert-level=level     (default),  or , amount of assertion testing,

                            causes a slowdown at runtime.

  --enable-memory-poisoning fill heap uninitialized allocated space with arbitrary data

  --valgrind=VALGRIND      run "make fate" tests through valgrind to detect memory

                           leaks and errors, using the specified valgrind binary.

                           Cannot be combined with --target-exec

  --enable-ftrapv          Trap arithmetic overflows

  --samples=PATH           location of test samples for FATE, if not set use

                           $FATE_SAMPLES at make invocation time.

  --enable-neon-clobber-test check NEON registers for clobbering (should be

                           used only for debugging purposes)

  --enable-xmm-clobber-test check XMM registers for clobbering (Win64-only;

                           should be used only for debugging purposes)

  --enable-random          randomly enable/disable components

  --disable-random

  --enable-random=LIST     randomly enable/disable specific components or

  --disable-random=LIST    component groups. LIST is a comma-separated list

                           of NAME[:PROB] entries where NAME is a component

                           (group) and PROB the probability associated with

                           NAME (default 0.5).

  --random-seed=VALUE      seed value for --enable/disable-random

NOTE: Object files are built at the place where configure is launched.

这些选项,这些选项是需要我们设置，有些选项可以是FFmpeg优化选项，可以针对CPU进行优化，也有一些选项可以不用编译进去，这样就可以减少编译出来的FFmpeg动态链接库的体积。

三、设置NDK：

export ANDROID_NDK=/path/to/your/android/ndk/root
export FF_BUILD_ROOT=`pwd`
export FF_BUILD_NAME=ffmpeg
export FF_ANDROID_PLATFORM=android-14
export FF_TOOLCHAIN_PATH=$FF_BUILD_ROOT/build/$FF_BUILD_NAME/toolchain
export FF_SYSROOT=$FF_TOOLCHAIN_PATH/sysroot
export FF_MAKE_TOOLCHAIN_FLAGS="--install-dir=$FF_TOOLCHAIN_PATH"
$ANDROID_NDK/build/tools/make-standalone-toolchain.sh  $FF_MAKE_TOOLCHAIN_FLAGS  --platform=$FF_ANDROID_PLATFORM  --toolchain=$FF_TOOLCHAIN_NAME

在这一点上，我们可以使用Android工具链独立位于$ TOOLCHAINE建立我们的FFmpeg的。关于Android独立的工具链更多细节可以在Android的NDK的文档中找到。

四、设置FFmpeg：

在前面我们知道了FFmpeg有设置选项并且知道每一个选项是什么意思，在这里我们需要的就是设置这些选项，如上面所写如果都这么写的话就麻烦死了，于是下面这些都是可以在bash中执行的脚本语言：

FF_PREFIX=$FF_BUILD_ROOT/build/$FF_BUILD_NAME/output
FF_CROSS_PREFIX=arm-linux-androideabi

PATH=$FF_TOOLCHAIN_PATH/bin:$PATH

CC="ccache ${FF_CROSS_PREFIX}-gcc"

LD=${FF_CROSS_PREFIX}-ld

AR=${FF_CROSS_PREFIX}-ar

STRIP=${FF_CROSS_PREFIX}-strip

FF_CFLAGS="-O3 -Wall -pipe \

                       -std=c99 \

                       -ffast-math \

                       -fstrict-aliasing -Werror=strict-aliasing \

                       -Wno-psabi -Wa,--noexecstack \

                       -DANDROID -DNDEBUG"

前面说了的，我们可以对configure设置进行裁剪，在这里可以参考我们第二步中的confingure选择我们需要的选项进行设置：

FF_CFG_FLAGS="$FF_CFG_FLAGS --arch=arm --cpu=cortex-a8"

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-neno"

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-thumb"

FF_EXTRA_CFLAGS="$FF_EXTRA_CFLAGS -march=armv7-a -mcpu=cortex-a8 -mfpu=vfpv3-d16 -mfloat-abi=softfp -mthumb"

FF_EXTRA_LDFLAGS="$FF_EXTRA_LDFLAGS -Wl,--fix-cortex-a8"

# Standard options:

FF_CFG_FLAGS="$FF_CFG_FLAGS --prefix=$FF_PREFIX"

#Licensing options:

#allow use of GPL code, the resulting libs

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-gpl"

#upgrade (L)GPL to version  [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-version3"

#allow use of nonfree code, the resulting libs and binaries will be unredistributable [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-nonfree"

#Configuration options:

#do not build static libraries [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-static"

#build shared libraries [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-shared"

#optimize for size instead of speed

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-small"

#disable detecting cpu capabilities at runtime (smaller binary)

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-runtime-cpudetect"

#enable full grayscale support (slower color)

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-gray"

#disable alpha channel support in swscale

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-swsacle-alpha"

#Program options:

#do not build command line programs

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-programs"

#disable ffmpeg build

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-ffmpeg"

#disable ffplay build

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-ffplay"

#disable ffprobe build

FF_CFG_FLAGS="$FF_CFG_FLAGS --diable-ffprobe"

#disable ffserver build

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-ffserver"

#Documentation options:

#do not build documentation

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-doc"

#do not build HTML documentation pages

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-htmlpages"

#do not build man documentation pages

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-manmpages"

#do not build POD documentation pages

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-podpages"

#do not build text documentation pages

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-txtpages"

#Componet options:disable libpostproc build

#disable libavdevice build

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-avdevice"

#disable libavcodec build

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-avcodec"

#disable libavformat build

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-avformat"

#disable libavutil build

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-avutil"

#disable libswresample build

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-swresample"

#disable libswscale build

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-swscale"

#disable libpostproc build

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-postproc"

#disable libavfilter build

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-avfilter"

#enable libavresample build [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-avresample"

#disable pthreads [auto]

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-pthreads"

#disable Win32 threads [auto]

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-w32threads"

#disable OS/ threads [auto]

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-os2threads"

#disable network support [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-network"

#disable DCT code

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-dct"

#disable DWT code

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-dwt"

#disable LSP code

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-lsp"

#disable LZO decoder code

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-lzo"

#disable MDCT code

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-mdct"

#disable RDFT code

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-rdft"

#disable FFT code

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-fft"

#Hardware accelerators:

#disable DXVA2 code [autodetect]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-dxva2"

#disable VAAPI code [autodetect]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-vaapi"

#enable VDA code

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-vda"

#disable VDPAU code [autodetect]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-vdpau"

#Individual component options:

#disable all components listed below

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-everythins"

#disable all encoders

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-encoders"

#disable all decoders

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-decoders"

#disable decoder aac

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=aac"

#disable decoder aac_latm

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=aac_latm"

#disable decoder ac3

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=ac3"

#disable decoder ape

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=ape"

#disable decoder flac

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=flac"

#disable decoder flv

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=flv"

#disable decoder h261

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=h261"

#disable decoder h263

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=h263"

#disable decoder h263i

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=h263i"

#disable decoder h263p

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=h263p"

#disable decoder h264

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=h264"

#disable decoder mp3

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=mp3"

#disable decoder mp3float

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=mp3float"

#disable decoder mp3on4

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=mp3on4"

#disable decoder mp3on4float

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=mp3on4float"

#disable decoder mpeg4

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=mpeg4"

#disable decoder msmpeg4v1

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=msmpeg4v1"

#disable decoder msmpeg4v2

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=msmpeg4v2"

#disable decoder msmpeg4v3

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=msmpeg4v3"

#disable decoder pcm_*

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=pcm_*"

#disable decoder ra_144

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=ra_144"

#disable decoder ra_288

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=ra_288"

#disable decoder ralf

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=ralf"

#disable decoder rv10

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=rv10"

#disable decoder rv20

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=rv20"

#disable decoder rv30

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=rv30"

#disable decoder rv40

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=rv40"

#disable decoder theora

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=theora"

#disable decoder vc1

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vc1"

#disable decoder vorbis

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vorbis"

#disable decoder vp3

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vp3"

#disable decoder vp5

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vp5"

#disable decoder vp6

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vp6"

#disable decoder vp6a

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vp6a"

#disable decoder vp6f

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vp6f"

#disable decoder vp8

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=vp8"

#disable decoder webp

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=webp"

#disable decoder wmalossless

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=wmalossless"

#disable decoder wmapro

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=wmapro"

#disable decoder wmav1

FF_CFG_FLAGS="$FF_CFG_FLAGS --eanble-decoder=wmav1"

#disable decoder wmav2

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=wmav2"

#disable decoder wmv1

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=wmv1"

#disable decoder wmv2

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=wmv2"

#disable decoder wmv3

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-decoder=wmv3"

#disable all hwaccels

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-hwaccels"

#disable all muxers

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-muxers"

#disable all muxer mpegts

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-muxer=mpegts"

#disable all demuxers

FF_CFG_FLAGS="$FF_CFG_FLAGS --diable-demuxers"

#disable demuxer aac

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=aac"

#disable demuxer ac3

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=ac3"

#disable demuxer ape

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=ape"

#disable demuxer asf

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=asf"

#disable demuxer concat

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=concat"

#disable demuxer data

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=data"

#disable demuxer flac

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=flac"

#disable demuxer flv

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=flv"

#disable demuxer h261

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=h261"

#disable demuxer h263

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=h263"

#disable demuxer h264

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=h264"

#disable demuxer hls

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=hls"

#disable demuxer latm

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=latm"

#disable demuxer loas

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=loas"

#disable demuxer m4v

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=m4v"

#disable demuxer matroska

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=matroska"

#disable demuxer mov

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=mov"

#disable demuxer mp3

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=mp3"

#disable demuxer mpegps

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=mpegps"

#disable demuxer mpegts

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=mpegts"

#disable demuxer mpegtsraw

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=mpegtsraw"

#disable demuxer mpegvideo

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=mpegvideo"

#disable demuxer ogg

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=ogg"

#disable demuxer pcm_*

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=pcm_*"

#disable demuxer rm

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=rm"

#disable demuxer rtp

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=rtp"

#disable demuxer rtsp

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=rtsp"

#disable demuxer swf

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=swf"

#disable demuxer tta

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=tta"

#disable demuxer vc1

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=vc1"

#disable demuxer vc1t

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=vc1t"

#disable demuxer wav

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=wav"

#disable demuxer xmv

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-demuxer=xmv"

#disable demuxer xwma

FF_CFG_FLAGS="$FF_CFG_FLAGS --eanble-demuxer=xwma"

#disable all parsers

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-parsers"

#disable parser aac

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=aac"

#disable parser aac_latm

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=aac_latm"

#disable parser ac3

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parse=ac3"

#disable parser adx

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=adx"

#disable parser bmp

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=bmp"

#disable parser cavsvideo

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=cavsvideo"

#disable parser cook

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=cook"

#disable parser dca

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=dca"

#disable parser dirac

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=dirac"

#disable parser dnxhd

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=dnxhd"

#disable parser dvbsub

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=dvbsub"

#disable parser dvd_nav

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=dvd_nav"

#disable parser dvdsub

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=dvdsub"

#disable parser flac

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=flac"

#disable parser gsm

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=gsm"

#disable parser h261

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=h261"

#disable parser h263

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=h263"

#disable parser h264

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=h264"

#disable parser mjpeg

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=mjpeg"

#disable parser mlp

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=mlp"

#disable parser mpeg4video

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=mpeg4video"

#disable parser mpegaudip

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=mpegaudip"

#disable parser mpegvideo

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=mpegvideo"

#disable parser png

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=png"

#disable parser pnm

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=pnm"

#disable parser rv30

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=rv30"

#disable parser rv40

#FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=rv40"

#disable parser vc1

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=vc1"

#disable parser vorbis

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=vorbis"

#disable parser vp3

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=vp3"

#disable parser vp8

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-parser=vp8"

#disable all bsfs

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-bsfs"

#disable all protocols

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-protocols"

#disable all devices

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-devices"

#disable all filters

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-filters"

#External library support

#enable reading of AviSynth script files [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-avisynth"

#disable bzlib [autodetect]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-bzlib"

#enable fontconfig

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-fontconfig"

#enable frei0r video filtering

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-frei0r"

#enable gnutls [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-gnutls"

#disable iconv [autodetect]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-iconv"

#enable LADSPA audio filtering

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-ladspa"

#enable AAC+ encoding via libaacplus [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libaacplus"

#enable libass subtitles rendering [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libass"

#enable BluRay reading using libbluray [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libbluray"

#enable textual display using libcaca

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libcaca"

#enable CELT decoding via libcelt [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libcelt"

#enable audio CD grabbing with libcdio

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libcdio"

#enable IIDC- grabbing using libdc1394 and libraw1394 [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libdc1394"

#enable AAC encoding via libfaac [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libfaac"

#enable AAC de/encoding via libfdk-aac [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libfdk-aac"

#enable flite (voice synthesis) support via libflite [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libflite"

#enable libfreetype [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libfreetype"

#enable Game Music Emu via libgme [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libgme"

#enable GSM de/encoding via libgsm [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libgsm"

#enable iec61883 via libiec61883 [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libiec61883"

#enable iLBC de/encoding via libilbc [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libilbc"

#enable ModPlug via libmodplug [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libmodplug"

#enable MP3 encoding via libmp3lame [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libmp3lame"

#enable NUT (de)muxing via libnut, native (de)muxer exists [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libnut"

#enable AMR-NB de/encoding via libopencore-amrnb [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libopencore-amrnb"

# enable AMR-WB decoding via libopencore-amrwb [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libopencore-amrwb"

#enable video filtering via libopencv [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libopencv"

#enable JPEG  de/encoding via OpenJPEG [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libopenjpeg"

#enable Opus decoding via libopus [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libopus"

#enable Pulseaudio input via libpulse [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libpulse"

#enable quvi input via libquvi [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libquvi"

#enable RTMP[E] support via librtmp [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-librtmp"

#enable Dirac de/encoding via libschroedinger [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libschroedinger"

#enable fixed-point MP3 encoding via libshine [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libshine"

#enable Include libsoxr resampling [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libsoxr"

#enable Speex de/encoding via libspeex [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libspeex"

#enable SFTP protocol via libssh [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libssh"

#enable H. decoding via libstagefright [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libstagefright-h264"

#enable Theora encoding via libtheora [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libtheora"

#enable MP2 encoding via libtwolame [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libtwolame"

#enable Ut Video encoding and decoding via libutvideo [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libutvideo"

#enable libv4l2/v4l-utils [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libv4l2"

#enable video stabilization using vid.stab [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libvidstab"

#enable AAC encoding via libvo-aacenc [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libvo-aacenc"

#enable AMR-WB encoding via libvo-amrwbenc [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libvo-amrwbenc"

#enable Vorbis en/decoding via libvorbis, native implementation exists [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libvorbis"

#enable VP8 and VP9 de/encoding via libvpx [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libvpx"

#enable wavpack encoding via libwavpack [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libwavpack"

#enable H. encoding via x264 [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libx264"

#enable AVS encoding via xavs [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libxavs"

#enable Xvid encoding via xvidcore, native MPEG-/Xvid encoder exists [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libxvid"

#enable message passing via libzmq [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libzmq"

#enable teletext support via libzvbi [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-libzvbi"

#enable OpenAL 1.1 capture support [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-openal"

#enable OpenCL code

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-opencl"

#enable openssl [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-openssl"

#enable X11 grabbing [no]

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-x11grab"

#disable zlib [autodetect]

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-zlib"

#Advanced options (experts only):

FF_CFG_FLAGS="$FF_CFG_FLAGS --cross-prefix=${FF_CROSS_PREFIX}"

FF_CFG_FLAGS="$FF_CFG_FLAGS -enable-cross-compile"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --sysroot=PATH"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --sysinclude=PATH"

FF_CFG_FLAGS="$FF_CFG_FLAGS --target-os=$FF_TARGET_OS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --target-exec=CMD"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --target-path=DIR"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --toolchain=NAME"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --nm=NM"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --ar=AR"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --as=AS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --yasmexe=EXE"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --cc=CC"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --cxx=CXX"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --dep-cc=DEPCC"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --ld=LD"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --host-cc=HOSTCC"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --host-cflags=HCFLAGS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --host-cppflags=HCPPFLAGS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --host-ld=HOSTLD"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --host-ldflags=HLDFLAGS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --host-libs=HLIBS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --host-os=OS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --extra-cflags=ECFLAGS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --extra-cxxflags=ECFLAGS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --extra-ldflags=ELDFLAGS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --extra-libs=ELIBS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --extra-version=STRING"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --optflags=OPTFLAGS"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --build-suffix=SUFFIX"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --malloc-prefix=PREFIX"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --progs-suffix=SUFFIX"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --arch=ARCH"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --cpu=CPU"

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-pic"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-sram"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-thumb"

FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-symver"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-hardcoded-tables"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-safe-bitstream-reader"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-memalign-hack"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-lto"

#Optimization options(experts only)

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-asm"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-altivec"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-amd3dnow"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-amd3dnowext"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-mmx"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-mmxext"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-sse"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-sse2"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-sse3"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-ssse3"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-sse4"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-sse42"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-avx"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-fma4"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-armv5te"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-armv6"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-armv6t2"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-vfp"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-neon"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-vis"

FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-inline-asm"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-yasm"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-mips32r2"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-mipsdspr1"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-mipsdspr2"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-mipsfpu"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-fast-unaligned"

# Developer options (useful when working on FFmpeg itself):

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-coverage"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-debug"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-debug=LEVEL"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-optimizations"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-extra-warnings"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-stripping"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --assert-level=level"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-memory-poisoning"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --valgrind=VALGRIND"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-ftrapv"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --samples=PATH"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-xmm-clobber-test"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-random"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-random"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --enable-random=LIST"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --disable-random=LIST"

# FF_CFG_FLAGS="$FF_CFG_FLAGS --random-seed=VALUE"

五、编译ffmpeg：

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

if [ -f "./config.h" ]; then

    echo "\n resume configure \n"

else

    ./configure $FF_CFG_FLAGS \

        --extra-cflags="$FF_CFLAGS $FF_EXTRA_CFLAGS" \

        --extra-ldflags="$FF_EXTRA_LDFLAGS"

     make clean

fi

cp config.* $FF_PREFIX

make $FF_MAKEFLAGS

make install

六、如果一切正常，我们可以得到libavcodec.so，libavformat.so等开头的目录，我们需要将这些.o文件链接成一个.so动态库：

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 \

    compat/*.o \

    libavutil/*.o \

    libavutil/arm/*.o \

    libavcodec/*.o \

    libavcodec/arm/*.o \

    libavformat/*.o \

    libswresample/*.o \

    libswresample/arm/*.o \

    libswscale/*.o \

    -o $FF_PREFIX/libffmpeg.so

七、构建完成之后我们可以strip一下动态库，去掉一些无用的信息，这样可以降低动态链接库的体积:

arm-linux-androideabi-strip --strip-unneeded libffmpeg.so

注：本文参考https://vec.io/posts/how-to-build-ffmpeg-with-android-ndk编写。

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