加强版十六章视频读写

VideoCapture capture(0)用来打开系统摄像头

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#include<opencv2/opencv.hpp>

#include<iostream>

using namespace std;

using namespace cv;

int main(int argv, char** argc) {

VideoCapture capture(0);

if (!capture.isOpened()) {

printf("0");

}

namedWindow("frame", WINDOW_AUTOSIZE);

Mat frame;

while (true) {

bool ret = capture.read(frame);

if (!ret)break;

imshow("ret", frame);

char c = waitKey(50);

if (c == 27) {

break;

}

}

waitKey(0);

destroyAllWindows();

}
读取摄像头

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读取视频文件

获取帧数等信息

#include<opencv2/opencv.hpp>

#include<iostream>

using namespace std;

using namespace cv;

int main(int argv, char** argc) {

//VideoCapture capture(0);

VideoCapture capture("C:/newword/image/20.avi");

if (!capture.isOpened()) {

printf("0");

}

namedWindow("frame", WINDOW_AUTOSIZE);

int fps = capture.get(CAP_PROP_FPS);

int width = capture.get(CAP_PROP_FRAME_WIDTH);

int heigh = capture.get(CAP_PROP_FRAME_HEIGHT);

int num_of_frame = capture.get(CAP_PROP_FRAME_COUNT);

printf("frame size(f=%d,w=%d,h=%d,m=%d)", fps, width, heigh, num_of_frame);

Mat frame;

while (true) {

bool ret = capture.read(frame);

if (!ret)break;

imshow("ret", frame);

char c = waitKey(50);

if (c == 27) {

break;

}

}

waitKey(0);

destroyAllWindows();

}

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读取视频文件或摄像头，将读取视频的保存

#include<opencv2/opencv.hpp>

#include<iostream>

using namespace std;

using namespace cv;

int main(int argv, char** argc) {

VideoCapture capture(0);

//VideoCapture capture("C:/newword/image/20.avi");

if (!capture.isOpened()) {

printf("0");

}

namedWindow("frame", WINDOW_AUTOSIZE);

int fps = capture.get(CAP_PROP_FPS);

int width = capture.get(CAP_PROP_FRAME_WIDTH);

int heigh = capture.get(CAP_PROP_FRAME_HEIGHT);

int num_of_frame = capture.get(CAP_PROP_FRAME_COUNT);

int type = capture.get(CAP_PROP_FOURCC);

printf("frame size(f=%d,w=%d,h=%d,m=%d)", fps, width, heigh, num_of_frame);

Mat frame;

VideoWriter writer("C:/newword/image/232320.mp4", type, fps, Size(width, heigh), true);

while (true) {

bool ret = capture.read(frame);

if (!ret)break;

imshow("ret", frame);

writer.write(frame);

char c = waitKey(50);

if (c == 27) {

break;

}

}

waitKey(0);

destroyAllWindows();

}