是通过Rtsp流地址抓拍的图片 运行一段时间后就会出现missing picture in access unit
有时候运行五分钟 有时候运行几个小时 望各位大佬拉小弟脱离此坑

int CaptureJpg(const string& curl)
{
if (curl.empty())
{
TextLog::Singleton().Write("log.log", "url empty");
return -1;
}
string ip;
GetIP(curl, ip);//从Rtsp流地址中获取ip
if (!ping(ip))//检测网络
{
TextLog::Singleton().Write("log.log", "Camera connection failed");
return -1;
}

cout << curl << endl;
VideoCapture cap(curl);
if (!cap.isOpened())
{
    return -1;
}
    Mat frame;
    string fname;
    time_t milsecond;
    time(&milsecond);
    fname = to_string(milsecond) + ".jpg";
    if (cap.read(frame))
    {
        //imshow("Video", image);
        if (frame.empty())
        {
            TextLog::Singleton().Write("log.log", "frame empty");
            return -1;
        }
        TextLog::Singleton().Write("log.log", fname);
        vector<int> compression_params;
        compression_params.push_back(CV_IMWRITE_JPEG_QUALITY);  //选择jpeg 
        compression_params.push_back(30); //在这个填入你要的图片质量
        imwrite(fname.c_str(), frame, compression_params);
        DataCenter::Singlon().SetCameraljpg(fname); 
        frame.release();
    }
cap.release();
return 0;

}