[英]OpenCV 3 error 'CV_FOURCC': identifier not found
Just built OpenCV 3 on PC with Visual Studio 2013 and now I'm trying code but sadly I can't figure out what's wrong? 刚刚在装有Visual Studio 2013的PC上构建了OpenCV 3,现在我正在尝试代码,但可悲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 ==========
Couldn't figure out with what I have to replace "CV_FOURCC". 无法解决我必须替换“ CV_FOURCC”的问题。
edited: 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);
looks like this has changed in later versions of OpenCV to cv::VideoWriter::fourcc(...)
where ...
is the four-character-comma-separated list. 看起来这在OpenCV的更高版本中已更改为
cv::VideoWriter::fourcc(...)
,其中...
是四字符逗号分隔的列表。
More information here for OpenCV 3.4: https://docs.opencv.org/3.4/dd/d9e/classcv_1_1VideoWriter.html#afec93f94dc6c0b3e28f4dd153bc5a7f0 此处提供有关OpenCV 3.4的更多信息: https : //docs.opencv.org/3.4/dd/d9e/classcv_1_1VideoWriter.html#afec93f94dc6c0b3e28f4dd153bc5a7f0
我使用了错误的OpenCV源来构建我的库。
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