#include <stdint.h>
#include <stdio.h>
#include <string>
using namespace std;

int main(){
	//准备缓冲区
	char* buffer = new char[1024]();
	char* info = new char[10240]();
	uint32_t bytesRead=0, readCount=0;
    
	//转码命令行
	string command = "ffmpeg -ss 0 -t 3 -i <input-path> -vcodec libx264 -s 640x360 -y <output-path>  2>&1 ";
	//注意：Linux系统下要修改绝对路径

	//打开管道
	#ifdef WIN32
		FILE *pPipe = _popen(command.c_str(), "r");
	#else
		FILE *pPipe = popen(command.c_str(), "r");
	#endif
	
	if (!pPipe) {
		printf( "popen failed!\n");
		return -1;
	}

	//循环读取ffmepg的输出信息
	while (true) {
		bytesRead = fread(buffer, 1, 1024, pPipe);
		if (bytesRead == 0) {
			break;
		}
		memcpy(info + readCount, buffer, bytesRead);
		readCount += bytesRead;
	} 
	//转码完成，打印输出信息
	printf("finished,ok, readCount=%d!\n", readCount);	
	printf("Console out:%s!\n", info);
	
	
	//释放缓冲区，关闭管道
	if(buffer){
		delete [] buffer;
		buffer = NULL;
	}
	if(info){
		delete [] info;
		info = NULL;
	}

	#ifdef WIN32
		_pclose(pPipe);
	#else
		pclose(pPipe);
	#endif

	return 0;
}