FFmpeg是一套可以用來記錄吐辙、轉(zhuǎn)換數(shù)字音頻、視頻蘸劈，并能將其轉(zhuǎn)化為流的開源計算機程序昏苏。采用LGPL或GPL許可證。它提供了錄制、轉(zhuǎn)換以及流化音視頻的完整解決方案贤惯。它包含了非常先進的音頻/視頻編解碼庫libavcodec洼专，為了保證高可移植性和編解碼質(zhì)量，libavcodec里很多code都是從頭開發(fā)的孵构。
FFmpeg在Linux平臺下開發(fā)屁商，但它同樣也可以在其它操作系統(tǒng)環(huán)境中編譯運行，包括Windows颈墅、Mac OS X等蜡镶。這個項目最早由Fabrice Bellard發(fā)起，2004年至2015年間由Michael Niedermayer主要負責維護精盅。許多FFmpeg的開發(fā)人員都來自MPlayer項目帽哑，而且當前FFmpeg也是放在MPlayer項目組的服務(wù)器上。項目的名稱來自MPEG視頻編碼標準叹俏，前面的"FF"代表"Fast Forward"妻枕。
使用Shell腳本語言編譯音視頻.a靜態(tài)庫
第一步：下載音視頻框架
網(wǎng)上下載，非常簡單
官網(wǎng)地址：http://www.ffmpeg.org/download.html
通過Shell腳本下載音視頻框架
腳本代碼
#!/bin/bash
#庫名稱
source="ffmpeg-3.4"
#下載這個庫
if [ ! -r $source ]
then
#沒有下載粘驰，那么執(zhí)行下載操作
echo "沒有FFmpeg庫屡谐， 我們需要下載。蝌数。愕掏。。顶伞。饵撑。"
#下載
curl http://ffmpeg.org/releases/${source}.tar.bz2 | tar xj || exit 1
fi
'curl'命令：它可以通過http/ftp等這樣的網(wǎng)絡(luò)方式下載和上傳文件（一個強大網(wǎng)絡(luò)工具），
基本格式：curl 地址
${source}.tar.bz2：制定下載版本
tar：表示解壓和壓縮唆貌，語法：tar options滑潘，例如：tar xj （x表示解壓文件選項，j表示需要解壓bz2壓縮包）
第二步：查看FFmpeg音視頻編譯配置選項
1锨咙、查看選項
- 進入FFmpeg框架包中
- 執(zhí)行命令查看配置 ./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
$FATE_SAMPLES at make invocation time.
--enable-neon-clobber-test check NEON registers for clobbering (should be
used only for debugging purposes)
--enable-xmm-clobber-test check XMM registers for clobbering (Win64-only;
should be used only for debugging purposes)
--enable-random randomly enable/disable components
--disable-random
--enable-random=LIST randomly enable/disable specific components or
--disable-random=LIST component groups. LIST is a comma-separated list
of NAME[:PROB] entries where NAME is a component
(group) and PROB the probability associated with
NAME (default 0.5).
--random-seed=VALUE seed value for --enable/disable-random
--disable-valgrind-backtrace do not print a backtrace under Valgrind
(only applies to --disable-optimizations builds)
--enable-osfuzz Enable building fuzzer tool
--libfuzzer=PATH path to libfuzzer
--ignore-tests=TESTS comma-separated list (without "fate-" prefix
in the name) of tests whose result is ignored
--enable-linux-perf enable Linux Performance Monitor API
NOTE: Object files are built at the place where configure is launched.
幫助文檔.png
標準選項.png
許可選項(侵權(quán)).png
配置備選選項.png
外部庫支持.png
工具鏈選項.png
優(yōu)化選項.png
開發(fā)者選項.png
第三步：編寫腳本代碼
#!/bin/bash
#1语卤、定義庫名稱
source="ffmpeg-3.4.2"
#2、定義一個臨時目錄酪刀，用于保存.c/.h/.m文件編譯后的.o文件
cache="cache"
#3粹舵、定義".a"靜態(tài)庫保存目錄 pwd獲取當前路徑
staticdir=`pwd`/"zrs-ffmpeg-iOS"
#4、添加ffmpeg配置選項
#交叉編譯 --enable-cross-compile
#禁止使用debug模式 --disable-debug
#禁用程序 --disable-programs 不允許去建立一些命令行程序
#不需要編譯文檔 --disable-doc
#允許建立與我們位置無關(guān)的代碼 --enable-pic（默認的）
configure_flags="--enable-cross-compile --disable-debug --disable-programs --disable-doc --enable-pic"
#5骂倘、定義默認的CPU平臺架構(gòu)類型
#arm64 armv7 真機CUP架構(gòu)類型
#xb6_64 i38 模擬器
archs="arm64 armv7 xb6_64 i386"
#6眼滤、指定我們的這個庫編譯系統(tǒng)版本 ios7.0以及以上版本使用
targetversion="7.0"
#7、開始編譯
#y表示允許編譯 n表示不允許編譯
#complie="y"
#我是動態(tài)接受命令行輸入CPU平臺架構(gòu)類型（傳入?yún)?shù)）
#如果存在外部指令就執(zhí)行
if [ "$*" ]
then
#存在輸入?yún)?shù)历涝，也就是說：外部指定需要編譯cpu架構(gòu)類型
archs="$*"
fi
#8柠偶、安裝匯編器-yasm
#目的：通過軟件管理器(Homebrew)情妖，然后下載安裝（或者更新）我的匯編器
#判斷一下是否存在匯編器
if [ ! `which yasm` ]
then
#Homebrew:軟件管理器
#下載一個軟件管理器:安裝睬关、卸載诱担、更新、搜索等等...
#錯誤二：`which` brew
#正確二：`which brew`
if [ ! `which brew` ]
then
echo "安裝brew"
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" || exit 1
fi
echo "安裝yasm"
#成功了
#下載安裝這個匯編器
#exit 1->安裝失敗了电爹，那么退出程序
brew install yasm || exit 1
fi
#9蔫仙、循環(huán)編譯靜態(tài)庫
currentdir=`pwd`
for arch in $archs
do
echo "開始編譯。丐箩。摇邦。。屎勘。"
#9.1創(chuàng)建目錄
#在編譯結(jié)果目錄下-創(chuàng)建對應(yīng)平臺架構(gòu)類型
mkdir -p "$cache/$arch"
#9.2進入到當前目錄下
cd "$cache/$arch"
#9.3配置編譯器的cou架構(gòu)類型 -制定當前編譯cpu架構(gòu)類型
archflags="-arch $arch"
#9.4判斷是模擬器還是真機.a靜態(tài)庫
if [ "$arch" = "i386" -o "$arch" = "xb6_64" ]
then
#模擬器
platform="iPhoneSimulator"
#支持最小系統(tǒng)版本-iOS 系統(tǒng)
archflags="$archflags -mios-simulator-version-min=$targetversion"
else
#真機
#支持最小系統(tǒng)版本-iOS 系統(tǒng)
archflags="$archflags -mios-version-min=$targetversion -fembed-bitcode"
#注意優(yōu)化處理
#如果架構(gòu)類型是"arm64"施籍，那么
if [ "$arch" = "arm64" ]
then
#GNU匯編器（GNU Assembler），簡稱為GAS
#GASPP->匯編器預處理程序
#解決問題：分段錯誤
#通俗一點：就是程序運行時,變量訪問越界一類的問題
EXPORT="GASPP_FIX_XCODE5=1"
fi
fi
#10概漱、正式編譯
#tr命令可以對來自標準輸入的字符進行替換丑慎、壓縮和刪除
#'[:upper:]'->將小寫轉(zhuǎn)成大寫
#'[:lower:]'->將大寫轉(zhuǎn)成小寫
#將platform->轉(zhuǎn)成大寫或者小寫
echo "正式編譯...."
XCRUN_SDK=`echo $platform | tr '[:upper:]' '[:lower:]'`
#編譯器->編譯平臺
CC="xcrun -sdk $XCRUN_SDK clang"
#架構(gòu)類型->arm64
if [ "$arch" = "arm64" ]
then
#音視頻默認一個編譯命令
#preprocessor.pl幫助我們編譯FFmpeg->arm64位靜態(tài)庫
AS="gas-preprocessor.pl -arch aarch64 -- $CC"
else
#默認編譯平臺
AS="$CC"
fi
echo "執(zhí)行到了1"
#目錄找到FFmepg編譯源代碼目錄->設(shè)置編譯配置->編譯FFmpeg源碼
#--target-os:目標系統(tǒng)->darwin(mac系統(tǒng)早起版本名字)
#darwin:是mac系統(tǒng)、iOS系統(tǒng)祖宗
#--arch:CPU平臺架構(gòu)類型
#--cc：指定編譯器類型選項
#--as:匯編程序
#$configure_flags最初配置
#--extra-cflags
#--prefix：靜態(tài)庫輸出目錄
TMPDIR=${TMPDIR/%\/} $currentdir/$source/configure \
--target-os=darwin \
--arch=$arch \
--cc="$CC" \
--as="$AS" \
$configure_flags \
--extra-cflags="$archflags" \
--extra-ldflags="$archflags" \
--prefix="$staticdir/$arch" \
|| exit 1
echo "執(zhí)行了"
#解決問題->分段錯誤問題
#安裝->導出靜態(tài)庫(編譯.a靜態(tài)庫)
#執(zhí)行命令
make -j3 install $EXPORT || exit 1
#回到了我們的腳本文件目錄
cd $currentdir
done
1瓤摧、將文件gas-preprocessor.pl放入執(zhí)行文件目錄下
2竿裂、執(zhí)行文件 傳入?yún)?shù)arm64 ./ffmpeg-build.sh arm64
文件在：鏈接: https://pan.baidu.com/s/1lWf3w-rbs8Io-J-qTSxwxQ 密碼: ene9
