1.FFmpeg编译

1.1.安装yasm

这里我是直接通过ubuntu包安装的，当然也可以通过编译源码来安装。 sudo apt-get install yasm

1.2.下载FFmpeg

git clone https://git.ffmpeg.org/ffmpeg.git

1.3.配置、编译FFMPEG

./configure --prefix=host --enable-shared --disable-static --disable-doc 关于FFMPEG的配置参数，我们可以通过下面命令来查看 ./configure --help 然后执行 make make install 就可以在host目录下找到我们需要的动态库和头文件了 . ├── bin │ ├── ffmpeg │ ├── ffprobe │ └── ffserver ├── include │ ├── libavcodec │ ├── libavdevice │ ├── libavfilter │ ├── libavformat │ ├── libavutil │ ├── libswresample │ └── libswscale ├── lib │ ├── libavcodec.so -> libavcodec.so.57.64.101 │ ├── libavcodec.so.57 -> libavcodec.so.57.64.101 │ ├── libavcodec.so.57.64.101 │ ├── libavdevice.so -> libavdevice.so.57.1.100 │ ├── libavdevice.so.57 -> libavdevice.so.57.1.100 │ ├── libavdevice.so.57.1.100 │ ├── libavfilter.so -> libavfilter.so.6.65.100 │ ├── libavfilter.so.6 -> libavfilter.so.6.65.100 │ ├── libavfilter.so.6.65.100 │ ├── libavformat.so -> libavformat.so.57.56.101 │ ├── libavformat.so.57 -> libavformat.so.57.56.101 │ ├── libavformat.so.57.56.101 │ ├── libavutil.so -> libavutil.so.55.34.101 │ ├── libavutil.so.55 -> libavutil.so.55.34.101 │ ├── libavutil.so.55.34.101 │ ├── libswresample.so -> libswresample.so.2.3.100 │ ├── libswresample.so.2 -> libswresample.so.2.3.100 │ ├── libswresample.so.2.3.100 │ ├── libswscale.so -> libswscale.so.4.2.100 │ ├── libswscale.so.4 -> libswscale.so.4.2.100 │ ├── libswscale.so.4.2.100 │ └── pkgconfig └── share └── ffmpeg

2.使用FFMPEG

上面我们编译完了FFMPEG之后可以去运行以下bin目录下生成的可执行文件 ~/tmp/ffmpeg/ffmpeg/host/bin$ ./ffmpeg ./ffmpeg: error while loading shared libraries: libavdevice.so.57: cannot open shared object file: No such file or directory 发现系统提示找不到动态库，可以用 ldd ffmpeg 来查看运行当前可执行文件需要哪些动态库 ~/tmp/ffmpeg/ffmpeg/host/bin$ ldd ffmpeg linux-vdso.so.1 => (0x00007fffcfeaf000) libavdevice.so.57 => not found libavfilter.so.6 => not found libavformat.so.57 => not found libavcodec.so.57 => not found libswresample.so.2 => not found libswscale.so.4 => not found libavutil.so.55 => not found libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f41d6d9e000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f41d6b7f000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f41d67b9000) /lib64/ld-linux-x86-64.so.2 (0x00007f41d70c7000) 应该有很多人和我一样，不想编译FFMPEG之后还要动自己系统的环境，这时有一个简单的方法可以解决这个问题。就是在当前终端export一个环境变量。 ~/tmp/ffmpeg/ffmpeg/host$ export LD_LIBRARY_PATH=lib/   ~/tmp/ffmpeg/ffmpeg/host/bin$ export LD_LIBRARY_PATH=../lib/ ~/tmp/ffmpeg/ffmpeg/host/bin$ ldd ffmpeg linux-vdso.so.1 => (0x00007fff25150000) libavdevice.so.57 => ../lib/libavdevice.so.57 (0x00007f7348cc8000) libavfilter.so.6 => ../lib/libavfilter.so.6 (0x00007f73488e8000) libavformat.so.57 => ../lib/libavformat.so.57 (0x00007f73484cc000) libavcodec.so.57 => ../lib/libavcodec.so.57 (0x00007f7347034000) libswresample.so.2 => ../lib/libswresample.so.2 (0x00007f7346e17000) libswscale.so.4 => ../lib/libswscale.so.4 (0x00007f7346b8f000) libavutil.so.55 => ../lib/libavutil.so.55 (0x00007f7346917000) libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f73465f1000) libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f73463d3000) libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f734600d000) libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 (0x00007f7345dee000) libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f7345be9000) /lib64/ld-linux-x86-64.so.2 (0x00007f7348edb000) libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 (0x00007f73459e5000) libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 (0x00007f73457de000) 然后再去运行上面的可执行文件就可以了 ~/tmp/ffmpeg/ffmpeg/host/bin$ ./ffmpeg ffmpeg version n3.2.2-8-g64bb329 Copyright (c) 2000-2016 the FFmpeg developers built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) configuration: --prefix=host --enable-shared --disable-static --disable-doc libavutil 55. 34.101 / 55. 34.101 libavcodec 57. 64.101 / 57. 64.101 libavformat 57. 56.101 / 57. 56.101 libavdevice 57. 1.100 / 57. 1.100 libavfilter 6. 65.100 / 6. 65.100 libswscale 4. 2.100 / 4. 2.100 libswresample 2. 3.100 / 2. 3.100 Hyper fast Audio and Video encoder usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}... Use -h to get full help or, even better, run 'man ffmpeg'

3.测试程序

程序可以打印出FFmpeg类库的基本信息，使用该程序通常可以验证FFmpeg是否正确的安装配置 #include #define __STDC_CONSTANT_MACROS #ifdef __cplusplus extern "C" { #endif #include "libavcodec/avcodec.h" #include "libavformat/avformat.h" #include "libavfilter/avfilter.h" #ifdef __cplusplus }; #endif /** * AVFormat Support Information */ char * avformatinfo(){ char *info=(char *)malloc(40000); memset(info,0,40000); av_register_all(); AVInputFormat *if_temp = av_iformat_next(NULL); AVOutputFormat *of_temp = av_oformat_next(NULL); //Input while(if_temp!=NULL){ sprintf(info, "%s[In ] %10s ", info, if_temp->name); if_temp=if_temp->next; } //Output while (of_temp != NULL){ sprintf(info, "%s[Out] %10s ", info, of_temp->name); of_temp = of_temp->next; } return info; } /** * AVCodec Support Information */ char * avcodecinfo() { char *info=(char *)malloc(40000); memset(info,0,40000); av_register_all(); AVCodec *c_temp = av_codec_next(NULL); while(c_temp!=NULL){ if (c_temp->decode!=NULL){ sprintf(info, "%s[Dec]", info); } else{ sprintf(info, "%s[Enc]", info); } switch (c_temp->type){ case AVMEDIA_TYPE_VIDEO: sprintf(info, "%s[Video]", info); break; case AVMEDIA_TYPE_AUDIO: sprintf(info, "%s[Audio]", info); break; default: sprintf(info, "%s[Other]", info); break; } sprintf(info, "%s %10s ", info, c_temp->name); c_temp=c_temp->next; } return info; } /** * AVFilter Support Information */ char * avfilterinfo() { char *info=(char *)malloc(40000); memset(info,0,40000); avfilter_register_all(); AVFilter *f_temp = (AVFilter *)avfilter_next(NULL); while (f_temp != NULL){ sprintf(info, "%s[%15s] ", info, f_temp->name); f_temp=f_temp->next; } return info; } /** * Configuration Information */ char * configurationinfo() { char *info=(char *)malloc(40000); memset(info,0,40000); av_register_all(); sprintf(info, "%s ", avcodec_configuration()); return info; } int main(int argc, char* argv[]) { char *infostr=NULL; infostr=configurationinfo(); printf(" <> %s",infostr); free(infostr); infostr=avformatinfo(); printf(" <> %s",infostr); free(infostr); infostr=avcodecinfo(); printf(" <> %s",infostr); free(infostr); infostr=avfilterinfo(); printf(" <> %s",infostr); free(infostr); return 0; } 编译方法 ~/tmp/ffmpeg/ffmpeg/host/test$ g++ -I ../include/ hello_world.cpp -o hello_world -L../lib/ -lavcodec -lavdevice -lavfilter -lavformat -lavutil -I 指定头文件的搜索路径， -L指定动态库的搜索路径 -l指定要链接的动态库   这样编译出来的bin文件里面没有ffplay如果要生成ffplay需要下面两个步骤

1.编译SDL2

安装 libasound2-dev sudo apt-get install libasound2-dev 否则可能会报下面的错误，不能播放声音 SDL_OpenAudio (2 channels, 32000 Hz): No such audio device SDL_OpenAudio (1 channels, 32000 Hz): No such audio device No more combinations to try, audio open failed 下载SDL2 http://www.libsdl.org/release/SDL2-2.0.5.zip 编译SDL2 unzip SDL2-2.0.5.zip cd SDL2-2.0.5/ ./configure --prefix=/usr/local/ make sudo make install

2.重新配置编译FFMPEG

在执行./configure是添加 --enable-ffplay ./configure --prefix=host --enable-shared --disable-static --disable-doc --enable-ffplay make make install 这样就会在host/bin目录下生成ffplay了