刚刚在 PC 上使用 Visual Studio 2013 构建了 OpenCV 3，现在我正在尝试编写代码，但遗憾的是我不知道出了什么问题？
#include "opencv2/opencv.hpp"
#include <iostream>
using namespace std;
using namespace cv;
int main() {
VideoCapture vcap(0);
if (!vcap.isOpened()) {
cout << "Error opening video stream or file" << endl;
return -1;
}
int frame_width = vcap.get(cv::CAP_PROP_FRAME_WIDTH);
int frame_height = vcap.get(cv::CAP_PROP_FRAME_HEIGHT);
VideoWriter video("out.avi", CV_FOURCC('M', 'J', 'P', 'G'), 10, Size(frame_width, frame_height), true);
for (;;) {
Mat frame;
vcap >> frame;
video.write(frame);
imshow("Frame", frame);
char c = (char)waitKey(33);
if (c == 27) break;
}
return 0;
1>------ Build started: Project: ConsoleApplication12, Configuration: Release x64 ------
1> Source.cpp
1>Source.cpp(21): warning C4244: 'initializing' : conversion from 'double' to 'int', possible loss of data
1>Source.cpp(22): warning C4244: 'initializing' : conversion from 'double' to 'int', possible loss of data
1>Source.cpp(23): error C3861: 'CV_FOURCC': identifier not found
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
无法弄清楚我必须用什么来替换“CV_FOURCC”。
编辑:
int frame_width = vcap.get(cv::CAP_PROP_FRAME_WIDTH);
int frame_height = vcap.get(cv::CAP_PROP_FRAME_HEIGHT);
int codec = cv::VideoWriter::fourcc('M', 'J', 'P', 'G');
VideoWriter video("out.avi", codec, 10, Size(frame_width, frame_height), true);
最佳答案
看起来这在 OpenCV 的更高版本中已更改为 cv::VideoWriter::fourcc(...) 其中 ... 是四字符-逗号分隔列表。
更多关于 OpenCV 3.4 的信息:https://docs.opencv.org/3.4/dd/d9e/classcv_1_1VideoWriter.html#afec93f94dc6c0b3e28f4dd153bc5a7f0
关于c++ - OpenCV 3 错误 'CV_FOURCC' : identifier not found，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/51624448/