ffmpeg编译裁剪移植到arm-linux

源码裁剪参考：

ffmpeg源码裁剪移植到arm-linux

ffmpeg可以通过配置不同的编译选项来裁剪ffmpeg本身的大小，下面我基于2.1.3版本来说明。

至于支持哪些编译选项，可输入 ./configure --help 查看，如下：

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 filtersStandard 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]Licensing options:--enable-gpl             allow use of GPL code, the resulting libsand binaries will be under GPL [no]--enable-version3        upgrade (L)GPL to version 3 [no]--enable-nonfree         allow use of nonfree code, the resulting libsand 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-incompatible-fork-abi  enable incompatible Libav fork ABI (deprecated) [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 buildDocumentation 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 pagesComponent 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/2 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 codeHardware accelerators:--disable-dxva2          disable DXVA2 code [autodetect]--disable-vaapi          disable VAAPI code [autodetect]--enable-vda             enable VDA code--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 filtersExternal 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-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-1394 grabbing using libdc1394and 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-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 2000 de/encoding via OpenJPEG [no]--enable-libopus         enable Opus decoding 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-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.264 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-libx264         enable H.264 encoding via x264 [no]--enable-libxavs         enable AVS encoding via xavs [no]--enable-libxvid         enable Xvid encoding via xvidcore,native MPEG-4/Xvid encoder exists [no]--enable-libzmq          enable message passing via libzmq [no]--enable-libzvbi         enable teletext support via libzvbi [no]--enable-openal          enable OpenAL 1.1 capture support [no]--enable-opencl          enable OpenCL code--enable-openssl         enable openssl [no]--enable-x11grab         enable X11 grabbing [no]--disable-zlib           disable zlib [autodetect]Advanced options (experts only):--cross-prefix=PREFIX    use PREFIX for compilation tools []--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 []--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 []--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-libs=ELIBS       add ELIBS []--extra-version=STRING   version string suffix []--optflags=OPTFLAGS      override optimization-related compiler flags--build-suffix=SUFFIX    library name suffix []--malloc-prefix=PREFIX   prefix malloc and related names with PREFIX--progs-suffix=SUFFIX    program name suffix []--arch=ARCH              select architecture []--cpu=CPU                select the minimum required CPU (affectsinstruction selection, may crash on older CPUs)--enable-pic             build position-independent code--enable-sram            allow use of on-chip SRAM--enable-thumb           compile for Thumb instruction set--disable-symver         disable symbol versioning--enable-hardcoded-tables use hardcoded tables instead of runtime generation--disable-safe-bitstream-readerdisable buffer boundary checking in bitreaders(faster, but may crash)--enable-memalign-hack   emulate memalign, interferes with memory debuggers--enable-lto             use link-time optimizationOptimization options (experts only):--disable-asm            disable all assembler 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 SSE4.2 optimizations--disable-avx            disable AVX 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-vis            disable VIS optimizations--disable-inline-asm     disable use of inline assembler--disable-yasm           disable use of yasm assembler--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 slowDeveloper 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     0(default), 1 or 2, amount of assertion testing,2 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 memoryleaks 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-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 listof NAME[:PROB] entries where NAME is a component(group) and PROB the probability associated withNAME (default 0.5).--random-seed=VALUE      seed value for --enable/disable-randomNOTE: Object files are built at the place where configure is launched.

帮助介绍得很详细，我就不一一叙述了，主要提一下注意的点：

所有的enable/disable选项都有默认值，列出来的选项内容如果是

--enable-xxx ：说明默认是禁止的

--disable-xxx：说明默认是使能的

（PS: 当然有些选项说明后面也提示了 [NO] 来说明默认禁止）

--disable-all： disable building components, libraries and programs（加了这个选项后，所有库，执行文件都不会生成）

--disable-everything：disable all components listed below（加了这个选项，encoder，decoder，muxer，demuxer，protocol等等都不会编入库中）

基于上述两个选项，我们可以这么做：

首先--disable-all 禁止所有东西，然后加 --enable-avformat --enable-avcodec --enable-avutil 使能我们要的三个模块。

接着--disable-everything禁止组件中个所有子模块，然后--enable-muxer=mp4 --enable-muxer=avi --enable-protocol=file --enable-encoder=mpeg4，因为我们只需要往MP4或AVI文件写H264流

下面是我最终的编译选项：

./configure --prefix=./install --enable-cross-compile --target-os=linux --cpu=cortex-a7 --arch=arm --cross-prefix=arm-hisiv300-linux- --enable-small --disable-runtime-cpudetect  --disable-all --enable-avformat --enable-avcodec --enable-avutil --disable-everything --enable-muxer=mp4 --enable-muxer=avi --enable-protocol=file --enable-encoder=mpeg4 --disable-doc  --disable-debug --disable-iconv --disable-armv5te --disable-armv6 --disable-armv6t2

敲入上面编译选项，可得下面汇总情况：

install prefix            ./install
source path               .
C compiler                arm-hisiv300-linux-gcc
ARCH                      arm (cortex-a7)
big-endian                no
runtime cpu detection     no
ARMv5TE enabled           no
ARMv6 enabled             no
ARMv6T2 enabled           no
VFP enabled               yes
NEON enabled              yes
THUMB enabled             no
debug symbols             no
strip symbols             yes
optimize for size         yes
optimizations             yes
static                    yes
shared                    no
postprocessing support    no
new filter support        no
network support           no
threading support         pthreads
safe bitstream reader     yes
SDL support               no
opencl enabled            no
libzvbi enabled           no
texi2html enabled         no
perl enabled              yes
pod2man enabled           yes
makeinfo enabled          noExternal libraries:Enabled decoders:Enabled encoders:
h263                    mpeg4Enabled hwaccels:Enabled parsers:Enabled demuxers:Enabled muxers:
avi                     mov                     mp4Enabled protocols:
fileEnabled filters:Enabled bsfs:Enabled indevs:Enabled outdevs:License: LGPL version 2.1 or later
Creating config.mak, config.h, and doc/config.texi...

可以看到，基本所有东西都是关的，就encoders只支持h263,mpeg4， muxers只支持mp4,avi,mov， protocol只支持file

最终库的大小总共在1M左右，libavcodec.a（618KB）， libavformat.a（245KB），libavutil.a（233KB）

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