29.FFmpeg+OpenGLES+OpenSLES播放器实现(三.FFmpeg配置和编译脚本)

简介: 项目源码FFmpeg开发文档 编译过程中涉及到很多ndk中的so库和头文件以及交叉编译的工具,在命令执行的时候会在ndk相应的目录下去查找,所以我们可以使用export命令事先将这些路径设置到环境变量,使用的时候可以很方便的找到 //NDK加入环境变量.

项目源码
FFmpeg开发文档
编译过程中涉及到很多ndk中的so库和头文件以及交叉编译的工具,在命令执行的时候会在ndk相应的目录下去查找,所以我们可以使用export命令事先将这些路径设置到环境变量,使用的时候可以很方便的找到

//NDK加入环境变量,以我的ndk存放路径为例
export NDK=/root/renzhenming/ffmpeg/android-ndk-r14b

//ndk的platforms文件夹中存放的是各个版本架构下的so库和头文件
export PLATFORM=$NDK/platforms/android-21/arch-arm

//指定交叉编译工具的路径
export TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64

//指定输出类型,以armv7-a为例
export CPU=armv7-a

//指定so文件编译后的输出路径
export PREFIX=./android/$CPU
相关命令解析

脚本中定义了一个方法build_ffmpeg,最终它被调用两次生成支持neon和硬解码的so库和不支持neon和硬解码的so库
configure :是ffmpeg中已有的一个配置文件,我们的脚本其实也就是去执行这个文件,所有生成so的工作都在这里进行

prefix : 指定最终生成的so的安装目录

target-os : 指定目标系统,早期很多脚本在2.x上把这个指定为linux,可以,但是ffmpeg更新之后,在3.x的版本之上会导致问题,头文件找不到之类的,这是一点差异

cross-prefix:指定交叉编译的前缀,在交叉编译的情况下,比如交叉编译使用的gcc,那么会在gcc前加上这个前缀,就是一个完整的gcc工具的路径,可以通过这个路径找到这个工具(/home/renzhenming/ffmpeg/android-ndk-r14b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc)

sysroot:指定这套系统依赖的库和头文件位置,就是我们配置的PLATFORMS,交叉编译在本系统中是找不到这些库的,可以把这些库看作是交叉编译的环境。如果在编译时指定了-sysroot就是为编译时指定了逻辑目录。编译过程中需要引用的库,头文件,如果要到/usr/include目录下去找的情况下,则会在前面加上逻辑目录。

extra-cflags:是使用$(CC)(cc中指定的编译器)编译C文件的选项,给gcc提供的一系列参数,这个可配可不配。 -fPIC编译动态链接库的参数, -mfpu指定协处理器,-mfloat-abi=softfp软浮点

cc : linux下cc一般是一个符号连接,指向gcc,一般是makefile里面的一个名字,即宏定义,就把他当做一个已经定义好的变量,可以指定编译器即可,ffmpeg是c语言写的,这里指定gcc为编译器,g++是c++编译器

nm:符号查看工具,nm 命令显示关于指定 File 中符号的信息,文件可以是对象文件、可执行文件或对象文件库。如果文件没有包含符号信息,nm 命令报告该情况,但不把它解释为出错条件。 nm 命令缺省情况下报告十进制符号表示法下的数字值。

enable-shared:编译成动态库,大概在3.4之前的ffmpeg版本,我们编译的时候需要修改configure文件中的一些参数,因为默认生成的so库文件名有问题,无法直接调用,3.4不再需要手动修改

enable-runtime-cpudetect :开启运行期cpu检测,不支持的指令可以自动被替换

enable-gpl:强开源约束授权General Public License ,ffmpeg有2个协议可以选择,默认的编译配置是LGPL,可以不开源,但如果你编译时加入了 --enable-gpl那么必须以GPL发布 ,你的代码要开源,否则不准开启gpl,不开启有些库无法使用

enable-small:打出来的so更小

enable-asm:允许汇编,指令优化

支持硬解码,打开后jni可以调用java的源码
--enable-jni
--enable-mediacodec
解码器
--enable-decoder=h264_mediacodec
硬件加速
--enable-hwaccel=h264_mediacodec \

完整的编译脚本

这个脚本目前经过验证,可以正常的进行编译3.4版本和3.4.4版本的ffmpeg,前提是需要保证每一个配置参数的正确,一般如果编译出现问题,大多是由于ndk的几个路径错误,NDK/PLATFORM/TOOLCHAIN这三个变量核对一下是否和你的ndk目录一致

#!/bin/bash
echo "进入编译ffmpeg脚本"
NDK=/home/ren/ffmpeg/android-ndk-r14b
#5.0
PLATFORM=$NDK/platforms/android-21/arch-arm
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64
CPU=arm
#输出路径
PREFIX=./android/$CPU
function build_ffmpeg
{       
        echo "开始编译ffmpeg"
        ./configure \
    --prefix=$PREFIX \
    --target-os=android \
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
    --arch=arm \
    --cpu=$CPU  \
    --extra-libs=-lgcc \
    --sysroot=$PLATFORM \
    --extra-cflags="$CFLAG" \
    --cc=$TOOLCHAIN/bin/arm-linux-androideabi-gcc \
    --nm=$TOOLCHAIN/bin/arm-linux-androideabi-nm \
    --enable-shared \
    --enable-runtime-cpudetect \
    --enable-gpl \ 
    --enable-small \
    --enable-cross-compile \
    --disable-debug \
    --disable-static \
    --disable-doc \
    --disable-ffmpeg \
    --disable-ffplay \
    --disable-ffprobe \
    --disable-ffserver \
    --disable-postproc \
    --disable-avdevice \
    --disable-symver \ 
    --disable-stripping \
    $ADD 
    #开启16个线程
    make -j16
    make install
    echo "编译结束!"
}       
###########################################################
echo "编译支持neon和硬解码"
CPU=armv7-a
PREFIX=./android/armv7-a-neon-hard
#-fPIC 作用于编译阶段,告诉编译器产生与位置无关代码(Position-Independent Code),
#则产生的代码中,没有绝对地址,全部使用相对地址,故而代码可以被
#加载器加载到内存的任意位置,都可以正确的执行。这正是共享库所要
#求的,共享库被加载时,在内存的位置不是固定的。
#如果不加-fPIC,则加载.so文件的代码段时,代码段引用的数据对象需要重
#定位, 重定位会修改代码段的内容,这就造成每个使用这个.so文件代码段
#的进程在内核里都会生成这个.so文件代码段的copy.每个copy都不一样,
#取决于 这个.so文件代码段和数据段内存映射的位置. 也就是 
#不加fPIC编译出来的so,是要再加载时根据加载到的位置再次重定位的.(因
#为它里面的代码并不是位置无关代码) 
#如果被多个应用程序共同使用,那么它们必须每个程序维护一份.so的代码
#副本了.(因为.so被每个程序加载的位置都不同,显然这些重定位后的代码
#也不同,当然不能共享) 
#我们总是用fPIC来生成so,也从来不用fPIC来生成.a;

#-mfpu=neon 浮点协处理器指令,使用硬件浮点的时候,我们需要给编译器传递一些参数,让编译器编译出硬件浮点单元处理器能识别的指令。参数-mfpu就是用来指定要产生哪种硬件浮点运算指令,常用的右vfp和neon等.

#-mfloat-abi=soft使用这个参数时,其将调用软浮点库(softfloat lib)来持
#对浮点的运算,GCC编译器已经有这个库了,一般在libgcc里面。这
#时根本不会使用任何浮点指令,而是采用常用的指令来模拟浮点运算。
#但使用的ARM芯片不支持硬浮点时,可以考虑使用这个参数。
#-mfloat-abi=softfp
#-mfloat-abi=hard
#这两个参数都用来产生硬浮点指令,至于产生哪种类型的硬浮点指令,
#需要由-mfpu=xxx参数来指令。这两个参数不同的地方是:

#-mfloat-abi=softfp生成的代码采用兼容软浮点调用接口(即使用-mfloat-abi=soft时的调用接口),
#这样带来的好处是:兼容性和灵活性。库可以采用-mfloat-abi=soft编
#译,而关键的应用程序可以采用-mfloat-abi=softfp来编译。特别是在库
#由第三方发布的情况下。

#-mfloat-abi=hard生成的代码采用硬浮点(FPU)调用接口。这样要求所有
#库和应用程序必须采用这同一个参数来编译,否则连接时会出现接口不
#兼容错误。

#默认情况下,gcc在下面目录中搜索头文件:
#/usr/local/include/
#/usr/include/
#在下面目录中搜索库:
#/usr/local/lib/
#/usr/lib/

CFLAG="-I$PLATFORM/usr/include -fPIC -DANDROID -mfpu=neon -mfloat-abi=softfp "
#--enable-asm程序集优化
ADD="--enable-asm \
    #neon指令集,开发者可以为需要高性能的应用程序编写NEON指令来实现相应功能
    #NEON:SIMD(SingleInstructionMultipleData单指令多重数据)指令集,其针对多媒体
    #和讯号处理程式具备标准化的加速能力。
    --enable-neon \
    #添加jni支持,那么ffmpeg可以调用java代码
    --enable-jni \
    # 硬解码相关
    --enable-mediacodec \
    --enable-decoder=h264_mediacodec \
    --enable-hwaccel=h264_mediacodec "
build_ffmpeg

###########################################################
echo "编译不支持neon和硬解码"
CPU=armv7-a
PREFIX=./android/$CPU

#VFP:(VectorFloatPoint),向量浮点运算单元,arm11(s3c6410支持
#VFPv2),Cortex-#A8(s5pv210)支持VFPv3.
#-mfpu=name(neonorvfpvx)指定FPU单元
#-mfloat-abi=name(soft、hard、softfp):指定软件浮点或硬件浮点或兼容软浮点调用
#接口
#如果只指定-mfpu,那么默认编译不会选择选择硬件浮点指令集
#如果只指定-mfloat-abi=hard或者softfp,那么编译会使用硬件浮点指令集
CFLAG="-I$PLATFORM/usr/include -fPIC -DANDROID -mfpu=vfp -mfloat-abi=softfp "
ADD=
build_ffmpeg

ffmpeg编译参数解析

来自./configure --help

Help options:
  --help                   print this message
  --quiet                  Suppress showing informative output
  --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 [ffbuild/config.log]
  --disable-logging        do not log configure debug information
  --fatal-warnings         fail if any configure warning is generated
  --prefix=PREFIX          install in PREFIX [/usr/local]
  --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 [LIBDIR]
  --incdir=DIR             install includes in DIR [PREFIX/include]
  --mandir=DIR             install man page in DIR [PREFIX/share/man]
  --pkgconfigdir=DIR       install pkg-config files in DIR [LIBDIR/pkgconfig]
  --enable-rpath           use rpath to allow installing libraries in paths
                           not part of the dynamic linker search path
                           use rpath when linking programs (USE WITH CARE)
  --install-name-dir=DIR   Darwin directory name for installed targets

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 3 [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
  --disable-autodetect     disable automatically detected external libraries [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-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 [autodetect]
  --disable-w32threads     disable Win32 threads [autodetect]
  --disable-os2threads     disable OS/2 threads [autodetect]
  --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
  --disable-faan           disable floating point AAN (I)DCT code
  --disable-pixelutils     disable pixel utils in libavutil

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
  --disable-v4l2_m2m       disable V4L2 mem2mem code [autodetect]

External library support:

  Using any of the following switches will allow FFmpeg to link to the
  corresponding external library. All the components depending on that library
  will become enabled, if all their other dependencies are met and they are not
  explicitly disabled. E.g. --enable-libwavpack will enable linking to
  libwavpack and allow the libwavpack encoder to be built, unless it is
  specifically disabled with --disable-encoder=libwavpack.

  Note that only the system libraries are auto-detected. All the other external
  libraries must be explicitly enabled.

  Also note that the following help text describes the purpose of the libraries
  themselves, not all their features will necessarily be usable by FFmpeg.

  --disable-alsa           disable ALSA support [autodetect]
  --disable-appkit         disable Apple AppKit framework [autodetect]
  --disable-avfoundation   disable Apple AVFoundation framework [autodetect]
  --enable-avisynth        enable reading of AviSynth script files [no]
  --disable-bzlib          disable bzlib [autodetect]
  --disable-coreimage      disable Apple CoreImage framework [autodetect]
  --enable-chromaprint     enable audio fingerprinting with chromaprint [no]
  --enable-frei0r          enable frei0r video filtering [no]
  --enable-gcrypt          enable gcrypt, needed for rtmp(t)e support
                           if openssl, librtmp or gmp is not used [no]
  --enable-gmp             enable gmp, needed for rtmp(t)e support
                           if openssl or librtmp is not used [no]
  --enable-gnutls          enable gnutls, needed for https support
                           if openssl is not used [no]
  --disable-iconv          disable iconv [autodetect]
  --disable-jack           disable libjack support [autodetect]
  --enable-jni             enable JNI support [no]
  --enable-ladspa          enable LADSPA audio filtering [no]
  --enable-libass          enable libass subtitles rendering,
                           needed for subtitles and ass filter [no]
  --enable-libbluray       enable BluRay reading using libbluray [no]
  --enable-libbs2b         enable bs2b DSP library [no]
  --enable-libcaca         enable textual display using libcaca [no]
  --enable-libcelt         enable CELT decoding via libcelt [no]
  --enable-libcdio         enable audio CD grabbing with libcdio [no]
  --enable-libdc1394       enable IIDC-1394 grabbing using libdc1394
                           and libraw1394 [no]
  --enable-libfdk-aac      enable AAC de/encoding via libfdk-aac [no]
  --enable-libflite        enable flite (voice synthesis) support via libflite [no]
  --enable-libfontconfig   enable libfontconfig, useful for drawtext filter [no]
  --enable-libfreetype     enable libfreetype, needed for drawtext filter [no]
  --enable-libfribidi      enable libfribidi, improves drawtext filter [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-libkvazaar      enable HEVC encoding via libkvazaar [no]
  --enable-libmodplug      enable ModPlug via libmodplug [no]
  --enable-libmp3lame      enable MP3 encoding via libmp3lame [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-libopenh264     enable H.264 encoding via OpenH264 [no]
  --enable-libopenjpeg     enable JPEG 2000 de/encoding via OpenJPEG [no]
  --enable-libopenmpt      enable decoding tracked files via libopenmpt [no]
  --enable-libopus         enable Opus de/encoding via libopus [no]
  --enable-libpulse        enable Pulseaudio input via libpulse [no]
  --enable-librsvg         enable SVG rasterization via librsvg [no]
  --enable-librubberband   enable rubberband needed for rubberband filter [no]
  --enable-librtmp         enable RTMP[E] support via librtmp [no]
  --enable-libshine        enable fixed-point MP3 encoding via libshine [no]
  --enable-libsmbclient    enable Samba protocol via libsmbclient [no]
  --enable-libsnappy       enable Snappy compression, needed for hap encoding [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-libtesseract    enable Tesseract, needed for ocr filter [no]
  --enable-libtheora       enable Theora encoding via libtheora [no]
  --enable-libtwolame      enable MP2 encoding via libtwolame [no]
  --enable-libv4l2         enable libv4l2/v4l-utils [no]
  --enable-libvidstab      enable video stabilization using vid.stab [no]
  --enable-libvmaf         enable vmaf filter via libvmaf [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.264 encoding via x264 [no]
  --enable-libx265         enable HEVC encoding via x265 [no]
  --enable-libxavs         enable AVS encoding via xavs [no]
  --enable-libxcb          enable X11 grabbing using XCB [autodetect]
  --enable-libxcb-shm      enable X11 grabbing shm communication [autodetect]
  --enable-libxcb-xfixes   enable X11 grabbing mouse rendering [autodetect]
  --enable-libxcb-shape    enable X11 grabbing shape rendering [autodetect]
  --enable-libxvid         enable Xvid encoding via xvidcore,
                           native MPEG-4/Xvid encoder exists [no]
  --enable-libxml2         enable XML parsing using the C library libxml2 [no]
  --enable-libzimg         enable z.lib, needed for zscale filter [no]
  --enable-libzmq          enable message passing via libzmq [no]
  --enable-libzvbi         enable teletext support via libzvbi [no]
  --disable-lzma           disable lzma [autodetect]
  --enable-decklink        enable Blackmagic DeckLink I/O support [no]
  --enable-libndi_newtek   enable Newteck NDI I/O support [no]
  --enable-mediacodec      enable Android MediaCodec support [no]
  --enable-libmysofa       enable libmysofa, needed for sofalizer filter [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, needed for https support
                           if gnutls is not used [no]
  --disable-sndio          disable sndio support [autodetect]
  --disable-schannel       disable SChannel SSP, needed for TLS support on
                           Windows if openssl and gnutls are not used [autodetect]
  --disable-sdl2           disable sdl2 [autodetect]
  --disable-securetransport disable Secure Transport, needed for TLS support
                           on OSX if openssl and gnutls are not used [autodetect]
  --disable-xlib           disable xlib [autodetect]
  --disable-zlib           disable zlib [autodetect]

  The following libraries provide various hardware acceleration features:
  --disable-audiotoolbox   disable Apple AudioToolbox code [autodetect]
  --disable-cuda           disable dynamically linked Nvidia CUDA code [autodetect]
  --enable-cuda-sdk        enable CUDA features that require the CUDA SDK [no]
  --disable-cuvid          disable Nvidia CUVID support [autodetect]
  --disable-d3d11va        disable Microsoft Direct3D 11 video acceleration code [autodetect]
  --disable-dxva2          disable Microsoft DirectX 9 video acceleration code [autodetect]
  --enable-libdrm          enable DRM code (Linux) [no]
  --enable-libmfx          enable Intel MediaSDK (AKA Quick Sync Video) code via libmfx [no]
  --enable-libnpp          enable Nvidia Performance Primitives-based code [no]
  --enable-mmal            enable Broadcom Multi-Media Abstraction Layer (Raspberry Pi) via MMAL [no]
  --disable-nvenc          disable Nvidia video encoding code [autodetect]
  --enable-omx             enable OpenMAX IL code [no]
  --enable-omx-rpi         enable OpenMAX IL code for Raspberry Pi [no]
  --enable-rkmpp           enable Rockchip Media Process Platform code [no]
  --disable-vaapi          disable Video Acceleration API (mainly Unix/Intel) code [autodetect]
  --disable-vda            disable Apple Video Decode Acceleration code [autodetect]
  --disable-vdpau          disable Nvidia Video Decode and Presentation API for Unix code [autodetect]
  --disable-videotoolbox   disable VideoToolbox code [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 []
  --ln_s=LN_S              use symbolic link tool LN_S [ln -s -f]
  --strip=STRIP            use strip tool STRIP [strip]
  --windres=WINDRES        use windows resource compiler WINDRES [windres]
  --x86asmexe=EXE          use nasm-compatible assembler EXE [nasm]
  --cc=CC                  use C compiler CC [gcc]
  --cxx=CXX                use C compiler CXX [g++]
  --objcc=OCC              use ObjC compiler OCC [gcc]
  --dep-cc=DEPCC           use dependency generator DEPCC [gcc]
  --nvcc=NVCC              use Nvidia CUDA compiler NVCC [nvcc]
  --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-objcflags=FLAGS  add FLAGS to OBJCFLAGS []
  --extra-ldflags=ELDFLAGS add ELDFLAGS to LDFLAGS []
  --extra-ldexeflags=ELDFLAGS add ELDFLAGS to LDEXEFLAGS []
  --extra-ldlibflags=ELDFLAGS add ELDFLAGS to LDLIBFLAGS []
  --extra-libs=ELIBS       add ELIBS []
  --extra-version=STRING   version string suffix []
  --optflags=OPTFLAGS      override optimization-related compiler flags
  --nvccflags=NVCCFLAGS    override nvcc flags [-gencode arch=compute_30,code=sm_30 -O2]
  --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
  --env="ENV=override"     override the environment variables

Advanced options (experts only):
  --malloc-prefix=PREFIX   prefix malloc and related names with PREFIX
  --custom-allocator=NAME  use a supported custom allocator
  --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)
  --sws-max-filter-size=N  the max filter size swscale uses [256]

Optimization options (experts only):
  --disable-asm            disable all assembly optimizations
  --disable-altivec        disable AltiVec optimizations
  --disable-vsx            disable VSX optimizations
  --disable-power8         disable POWER8 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-xop            disable XOP optimizations
  --disable-fma3           disable FMA3 optimizations
  --disable-fma4           disable FMA4 optimizations
  --disable-avx2           disable AVX2 optimizations
  --disable-aesni          disable AESNI 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-x86asm         disable use of standalone x86 assembly
  --disable-mipsdsp        disable MIPS DSP ASE R1 optimizations
  --disable-mipsdspr2      disable MIPS DSP ASE R2 optimizations
  --disable-msa            disable MSA optimizations
  --disable-mipsfpu        disable floating point MIPS optimizations
  --disable-mmi            disable Loongson SIMD 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     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 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
  --disable-valgrind-backtrace do not print a backtrace under Valgrind
                           (only applies to --disable-optimizations builds)
  --enable-osfuzz          Enable building fuzzer tool
  --libfuzzer=PATH         path to libfuzzer
  --ignore-tests=TESTS     comma-separated list (without "fate-" prefix
                           in the name) of tests whose result is ignored
  --enable-linux-perf      enable Linux Performance Monitor API

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