王学岗ffmpeg编译

文档说明

帮助选项
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

标准选项
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

  我们最终产出的目录，c框架都有这个
  --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]

--disable  代表关闭状态
--enable   代表开启状态

Configuration options:
  --disable-static         do not build static libraries [no] == 开启静态库，no是取反
  --enable-shared          build shared libraries [no] == 关闭动态库
  --enable-small           optimize for size instead of speed == 可以优化库的大小，有这个的c库，开源框架强大

  --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 == 默认是关闭的，如果我们开启就会生成下面三个东东

  --disable-ffmpeg         disable ffmpeg build  == 使用FFmpeg命令
  --disable-ffplay         disable ffplay build  == 播放器
  --disable-ffprobe        disable ffprobe 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

FFmpeg 是由多个模块组成的：
Component options:
  --disable-avdevice       disable libavdevice build  == 模块之一（可以操控我们的摄像头-（Android中是不支持））
  --disable-avcodec        disable libavcodec build == av是audio video的简写 codec(编码 和 解码)
  --disable-avformat       disable libavformat build == 音视频格式生成和解析相关
  --disable-swresample     disable libswresample build == 音频 重采样（如果想把单声道，变成双声道）
  --disable-swscale        disable libswscale build == 对视频显示相关（对视频的缩放，放大 缩小）
  --disable-postproc       disable libpostproc build == 后期处理，很少用，可以关闭掉
  --disable-avfilter       disable libavfilter build == 给视频加水印，加字幕，特殊效果
  --enable-avresample      enable libavresample build (deprecated) [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  == 如果我们去播放视频，不需要编码，那么此功能就可以关闭掉
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Linux 上编译ffmpeg

./configure会报错误nasm/yasm not found or too old. Use --disable-x86asm for a crippled build.
./configure --disable-x86asm

写个.sh文件用NDK编译ffmpeg

#执行configure脚本，用于生成makefile
#--prefix：安装目录
#--enable-small：优化大小
#--disable-avdevice：关闭所有编码器（播放不需要编码）
#--disable-muxers：关闭所有复用器（封装器），不需要生成MP4这样的文件，所以关闭
#--disable-filters：关闭视频滤镜
#--enable-cross-compile：开启交叉编译
#disable-shared enable-static：不写也可以，默认就是这样
#--sysroot
#--extra-cflags：会传给gcc的参数
#--arch--target-os：
​NDK_ROOT=ndk路径
TOOLCHAIN=路径
PREFIX=./android/armeabi-v7a2
./configure \
--prefix=$PREFIX \
--enable-small \
--disable-programs \
--disable-avdevice \
--disable-encoders \
--disable-muxers \
--disable-filters \
--enable-cross-compile \
--cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \  
--disable-shared \
--enable-static \
--sysroot=$NDK_ROOT/platforms/android-17/arch-arm \
#兼容cmake和ninjia -D__ANDROID_API创建宏，-U_FILE_OFFSET_BITS  -DANDROID删除一个宏
--extra-cflags="-isysroot $NDK_ROOT/sysroot -isystem $NDK_ROOT/sysroot/usr/include/arm-linux-androideabi -D__ANDROID_API__=17 -U_FILE_OFFSET_BITS  -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=vfpv3-d16 -mthumb -Wa,--noexecstack -Wformat -Werror=format-security  -O0 -fPIC" \
#指定arm平台
--arch=arm \
#指定操作系统
--target-os=android
​#清理
make clean
#安装
make install
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