02 编写C语言，调用ffmpeg

假设定位到目录

/home/jiangqianghua/Desktop/ffmpeg

里面builded保存ffmpeg编译好的文件夹

里面ctest是编写c测试文件夹

1 配置环境变量

>>vim /etc/profile

末尾添加

LD_LIBRARY_PATH=/home/jiangqianghua/Desktop/ffmpeg/ffmpeg-2.8.13/builded/lib

export LD_LIBRARY_PATH

>> source /etc/profile

或者

>>export LD_LIBRARY_PATH=LD_LIBRARY_PATH=/home/jiangqianghua/Desktop/ffmpeg/ffmpeg-2.8.13/builded/lib/

测试

>> ldd ./ffmpeg

2 编写C语言代码

ffmpegtest.c

#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\n", info, if_temp->name);

if_temp=if_temp->next;

}

//Output

while (of_temp != NULL){

sprintf(info, "%s[Out] %10s\n", 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\n", 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]\n", 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\n", avcodec_configuration());

return info;

}

int main(int argc, char* argv[])

{

char *infostr=NULL;

infostr=configurationinfo();

printf("\n<>\n%s",infostr);

free(infostr);

infostr=avformatinfo();

printf("\n<>\n%s",infostr);

free(infostr);

infostr=avcodecinfo();

printf("\n<>\n%s",infostr);

free(infostr);

infostr=avfilterinfo();

printf("\n<>\n%s",infostr);

free(infostr);

return 0;

}

执行命令

>>sudo gcc -I ../builded/include/ ffmpegtest.c -o ffmpegtest -L ../builded/lib/ -lavcodec -lavdevice -lavfilter -lavformat -lavutil -lswresample -lswscale

运行

>>sudo ./ffmpegtest

注意事项运行会出现so找不到，提示

ffmpeg: error while loading shared libraries: libavfilter.so.1: cannot open shared object file: No such file or directory

解决办法

编辑/etc/ld.so.conf文件加入如下内容

保存退出后执行ldconfig命令

/home/jiangqianghua/Desktop/ffmpeg/ffmpeg-2.8.13/builded/lib

参考地址

http://www.cnblogs.com/CoderTian/p/6655568.html