关于c++:ffmpeg源码编译环境搭建

ffmpeg是视频开发最罕用到的开源软件，ffmpeg功能强大，用处宽泛，提供简直所有你可能想到的与视频开发相干的操作，许多商业软件都以ffmpeg为根底进行开发定制。

FFmpeg: FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the FFmpeg program itself, designed for command-line-based processing of video and audio files, and widely used for format transcoding, basic editing (trimming and concatenation), video scaling, video post-production effects, and standards compliance (SMPTE, ITU) . 摘自wikipedia

ffmpeg性能宏大，向开发者提供了丰盛的函数库调用，罕用的函数库包含：

libavcodec - 各种格局的音视频编解码
libavformat - 各种音视频封装格局的生成和解析，包含获取解码所需信息、读取音视频数据等性能
libswscale - 视频图像缩放的库，提供色彩空间转换、图像格式转换的性能
libavutil - 工具库，包含算数运算，字符操作等
libpostproc - 对视频做预处理的库
libpostproc - 滤镜性能库
libavdevice - 提供了拜访捕捉设施和回放设施的接口

此外，ffmpeg还向开发者提供了丰盛的命令行工具，对于不相熟ffmpeg的开发者来说，能够先通过这些命令行工具，对ffmpeg的基本功能有个大抵的理解，上面咱们就开始正式探讨。

1、ffmpeg装置

这里以Ubuntu 16 LTS版为例介绍FFmpeg的装置。

增加PPA源

ffmpeg 4是目前最新的发行版本，如果要装置该版本，须要增加PPA源，执行以下命令增加PPA仓库到Ubuntu零碎

sudo add-apt-repository ppa:jonathonf/ffmpeg-4

装置ffmpeg

通过以下命令装置ffmpeg

sudo apt-get updatesudo apt-get install ffmpeg

能够看到x264等相干的动静库文件也会一起装置

sudo apt-get install ffmpeg[sudo] password for ron: Reading package lists... DoneBuilding dependency tree       Reading state information... DoneThe following additional packages will be installed:  libaom0 libavcodec58 libavdevice58 libavfilter7 libavformat58 libavresample4 libavutil56 libbs2b0 libchromaprint1 libcodec2-0.4  libflite1 liblilv-0-0 libmysofa1 libnorm1 libopenjp2-7 libopenmpt0 libpgm-5.2-0 libpocketsphinx3 libpostproc55 librabbitmq4  librubberband2v5 libserd-0-0 libsodium18 libsord-0-0 libsphinxbase3 libsratom-0-0 libsrt1-gnutls libswresample3 libswscale5  libvdpau1 libvidstab1.1 libx264-155 libx265-192 libzmq5 mesa-vdpau-drivers vdpau-driver-allSuggested packages:  ffmpeg-doc serdi sordi libvdpau-va-gl1 nvidia-vdpau-driver nvidia-legacy-340xx-vdpau-driverRecommended packages:  pocketsphinx-hmm-en-hub4wsj | pocketsphinx-hmm-zh-tdt | pocketsphinx-hmm-en-tidigits pocketsphinx-lm-en-hub4  | pocketsphinx-lm-zh-hans-gigatdt | pocketsphinx-lm-zh-hant-gigatdtThe following NEW packages will be installed:  ffmpeg libaom0 libavcodec58 libavdevice58 libavfilter7 libavformat58 libavresample4 libavutil56 libbs2b0 libchromaprint1  libcodec2-0.4 libflite1 liblilv-0-0 libmysofa1 libnorm1 libopenjp2-7 libopenmpt0 libpgm-5.2-0 libpocketsphinx3 libpostproc55  librabbitmq4 librubberband2v5 libserd-0-0 libsodium18 libsord-0-0 libsphinxbase3 libsratom-0-0 libsrt1-gnutls libswresample3  libswscale5 libvdpau1 libvidstab1.1 libx264-155 libx265-192 libzmq5 mesa-vdpau-drivers vdpau-driver-all0 upgraded, 37 newly installed, 0 to remove and 233 not upgraded.Need to get 29.2 MB of archives.After this operation, 106 MB of additional disk space will be used.Do you want to continue? [Y/n]

确认ffmpeg装置胜利

ffmpeg装置实现后，能够通过ffmpeg -version命令打印FFmpeg的版本号，可能胜利打印即可确认ffmpeg装置胜利。

ffmpeg -version

2、ffmpeg源码编译

ffmpeg源码编译并不需要如许简单的编译环境，只须要根本的编译器及依赖库即可。ffmpeg反对多个支流平台的开发，这里次要讲述如何在linux环境下进行编译。

ffmpeg编译环境筹备

这里以ubuntu零碎为例进行讲述，其余linux发行版原理相似。
在linux零碎上编译须要装置gcc make等组件，能够用下命令进行装置

sudo apt-get install build-essential

输出gcc -v命令即可查问以后的gcc版本号

gcc -v

ffmpeg依赖库筹备

ffmpeg源码编译次要依赖x264、yasm这两个组件，在搜索引擎中能够非常容易到找到它们的源码包，通过源码包编译装置的形式还可用于嵌入式环境

x264: x264 is a free software library and application for encoding video streams into the H.264/MPEG-4 AVC compression format, and is released under the terms of the GNU GPL.
Yasm: Yasm is a complete rewrite of the NASM assembler under the “new” BSD License,Yasm currently supports the x86 and AMD64 instruction sets, accepts NASM and GAS assembler syntaxes, outputs binary, ELF32, ELF64, 32 and 64-bit Mach-O, RDOFF2, COFF, Win32, and Win64 object formats, and generates source debugging information in STABS, DWARF 2, and CodeView 8 formats.

上面给出源码包的链接地址

https://ffmpeg.org/download.h...
http://download.videolan.org/...
http://yasm.tortall.net/Downl...

这里实测过的源码版本别离是

x264-0.148 (x264 snapshot-20170307-2245)yasm-1.3.0ffmpeg-3.2.4

其中，x264提供对h.264编码器的反对，yasm用于对汇编优化的反对，若不须要汇编优化的反对，可在编译选项中敞开yasm即可(--disable-yasm)

在Linux下可采纳以下形式配置编译选项：

yasm configure配置

./configure --prefix=/usr/local/3rdparty/yasm

x264 configure配置

./configure --prefix=/usr/local/3rdparty/x264 --enable-shared --enable-static --enable-yasm

生成Makefile文件后，输出make命令即可开始编译过程，编译实现后，执行make install命令进行装置

make sudo make install

x264、yasm编译实现后，还须要让零碎可能找到对应的装置地位。关上/etc/profile配置文件，在该文件底部增加各组件的环境变量

# YASMexport PATH="$PATH:/usr/local/3rdparty/yasm/bin/"export LD_LIBRARY_PATH=/usr/local/3rdparty/yasm/lib:$LD_LIBRARY_PATH# X264export PATH="$PATH:/usr/local/3rdparty/x264/bin/"export LD_LIBRARY_PATH=/usr/local/3rdparty/x264/lib:$LD_LIBRARY_PATHexport PKG_CONFIG_PATH=/usr/local/3rdparty/x264/lib/pkgconfig:$PKG_CONFIG_PATH

应用source /etc/profile命令刷新环境变量

source /etc/profile

环境变量配置实现后，能够通过上面的命令确认x264等依赖组件是否编译装置胜利

x264 --versionx264 0.148.xbuilt on May 22 2019, gcc: 5.4.0 20160609x264 configuration: --bit-depth=8 --chroma-format=alllibx264 configuration: --bit-depth=8 --chroma-format=allx264 license: GPL version 2 or lateryasm --versionyasm 1.3.0Compiled on May  6 2015.Copyright (c) 2001-2014 Peter Johnson and other Yasm developers.Run yasm --license for licensing overview and summary.

ffmpeg源码编译

在Linux下可采纳以下形式配置编译选项：

ffmpeg configure配置

./configure --prefix=/usr/local/3rdparty/ffmpeg --enable-shared --enable-yasm --enable-libx264 --enable-gpl --enable-pthreads --extra-cflags=-I/usr/local/3rdparty/x264/include --extra-ldflags=-L/usr/local/3rdparty/x264/lib

生成Makefile文件后，输出make命令即可开始编译过程，编译实现后，执行make install命令进行装置

make sudo make install

编译实现后，在源码目录生成ffmpeg、ffserver、ffprobe等命令行工具，其中

ffmpeg - 命令行工具反对视频编解码、视频转码、视频格式转换、视频推流等性能
ffserver - 命令行工具与ffmpeg配合，负责响应客户端的流媒体申请，把流媒体数据发送给客户端
ffprobe - 命令行工具用来查看多媒体文件的形容信息

ffmpeg环境变量配置

在ffmpeg及其依赖环境编译实现后，还须要让零碎可能找到对应的装置地位。关上/etc/profile配置文件，在该文件底部增加各组件的环境变量

# FFMPEGexport PATH="$PATH:/usr/local/3rdparty/ffmpeg/bin/"export LD_LIBRARY_PATH=/usr/local/3rdparty/ffmpeg/lib:$LD_LIBRARY_PATHexport PKG_CONFIG_PATH=/usr/local/3rdparty/ffmpeg/lib/pkgconfig:$PKG_CONFIG_PATH

应用source /etc/profile命令刷新环境变量

source /etc/profile

应用ffmpeg -version命令打印版本号，这里采纳的ffmpeg是3.2.4版本

ffmpeg -versionffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developersbuilt with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.12) 20160609configuration: --prefix=/usr/local/3rdparty/ffmpeg --enable-shared --enable-yasm --enable-libx264 --enable-gpl --enable-pthreads --extra-cflags=-I/usr/local/3rdparty/x264/include --extra-ldflags=-L/usr/local/3rdparty/x264/liblibavutil      55. 34.101 / 55. 34.101libavcodec     57. 64.101 / 57. 64.101libavformat    57. 56.101 / 57. 56.101libavdevice    57.  1.100 / 57.  1.100libavfilter     6. 65.100 /  6. 65.100libswscale      4.  2.100 /  4.  2.100libswresample   2.  3.100 /  2.  3.100libpostproc    54.  1.100 / 54.  1.100

在ffmpeg源码门路下，能够通过ldd命令查问ffmpeg依赖的所有组件，若其中的某些组件无奈找到，则须要对照本文查问是否有依赖的组件未配置环境变量。相似的，也可通过ldd命令在对应的门路下查问x264等组件的依赖项。

ldd ffmpeg    linux-vdso.so.1 =>  (0x00007ffc24f84000)    libavdevice.so.57 => /usr/local/3rdparty/ffmpeg/lib/libavdevice.so.57 (0x00007fc17da42000)    libavfilter.so.6 => /usr/local/3rdparty/ffmpeg/lib/libavfilter.so.6 (0x00007fc17d613000)    libavformat.so.57 => /usr/local/3rdparty/ffmpeg/lib/libavformat.so.57 (0x00007fc17d1f3000)    libavcodec.so.57 => /usr/local/3rdparty/ffmpeg/lib/libavcodec.so.57 (0x00007fc17bcbf000)    libpostproc.so.54 => /usr/local/3rdparty/ffmpeg/lib/libpostproc.so.54 (0x00007fc17baa3000)    libswresample.so.2 => /usr/local/3rdparty/ffmpeg/lib/libswresample.so.2 (0x00007fc17b887000)    libswscale.so.4 => /usr/local/3rdparty/ffmpeg/lib/libswscale.so.4 (0x00007fc17b5ff000)    libavutil.so.55 => /usr/local/3rdparty/ffmpeg/lib/libavutil.so.55 (0x00007fc17b385000)    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fc17b07c000)    libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007fc17ae5f000)    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fc17aa95000)    libXv.so.1 => /usr/lib/x86_64-linux-gnu/libXv.so.1 (0x00007fc17a890000)    libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 (0x00007fc17a556000)    libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 (0x00007fc17a344000)    libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007fc17a122000)    libxcb-shm.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shm.so.0 (0x00007fc179f1e000)    libxcb-xfixes.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-xfixes.so.0 (0x00007fc179d16000)    libxcb-shape.so.0 => /usr/lib/x86_64-linux-gnu/libxcb-shape.so.0 (0x00007fc179b12000)    libasound.so.2 => /usr/lib/x86_64-linux-gnu/libasound.so.2 (0x00007fc179812000)    libSDL2-2.0.so.0 => /usr/local/3rdparty/sdl2/lib/libSDL2-2.0.so.0 (0x00007fc1794df000)    libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fc1792c5000)    libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fc1790c1000)    libx264.so.148 => /usr/local/3rdparty/x264/lib/libx264.so.148 (0x00007fc178d1b000)    liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fc178af9000)    /lib64/ld-linux-x86-64.so.2 (0x00007fc17dc5a000)    libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007fc1788f5000)    libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007fc1786ef000)    librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fc1784e7000)

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