本文共 991 字，大约阅读时间需要 3 分钟。

 一、Opencv读取视频

注意：需要用到这两个库，使用时记得添加-lopencv_video -lopencv_videoio

#include
   
    #include
    
     using namespace cv;using namespace std;void main(){    VideoCapture cap;    cap.open("./face.mp4");    if(!cap.isOpened())        return;    int width = cap.get(CV_CAP_PROP_FRAME_WIDTH);  //帧宽度    int height = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //帧高度    int frameRate = cap.get(CV_CAP_PROP_FPS);  //帧率 x frames/s    int totalFrames = cap.get(CV_CAP_PROP_FRAME_COUNT); //总帧数    cout<<"视频宽度="<
     
      <
      
       0)            break;    }    cap.release();}
      
     
    
   

二、调用摄像头

cv::VideoCapture cap(0);  //视频    while(/*cap.read(img)*/1) {        ti.reset();        //double t1 = (double)getTickCount();                //t1 = (double)getTickCount() - t1;        //time += t1 * 1000 / cv::getTickFrequency();        time += ti.elapsedMilliSeconds();        count ++;        if(count % 1000 == 0) {            printf("face detection average time = %f.\n", time / count);        }    }

转载地址：http://nlpdz.baihongyu.com/