CODEWITHSUNDEEP
c++opencverror-handling
r5ha
r5ha

Reputation: 342

How can I get what went wrong in initialization of OpenCV's VideoCapture?

I want to open video file dt_passat.mpg with OpenCV. I use the following code:

#include <stdio.h>
#include <opencv2/opencv.hpp>

using namespace cv;

int main( int argc, char** argv )
{
    VideoCapture capture("dt_passat.mpg");
    if (!capture.isOpened()) {
        std::cerr << "ERR: capture is not opened" << std::endl;
        getchar();
        return -1;
    }
}

However, it fails, and I don't know why. How can I get the point of the problem with initialization of VideoCapture (not found file/corrupted file/unknown codec/etc.)?

Upvotes: 2

Views: 283

Answers (2)

Martin Beckett
Martin Beckett

Reputation: 96109

The opencv image/video/camera IO and gui are really only meant to get sample data in and out to test algorithms to make a real application you need a more capable general library for system stuff.

However the actual image processing algorithms are pretty good quality.

Upvotes: 1

PureW
PureW

Reputation: 5085

Unfortunately, OpenCV does not always have the best documentation.

You can try looking at the internal error code using cvGetErrorStatus() and then turn that into a readable string with cvErrorStr(). See http://opencv.willowgarage.com/documentation/c/core_utility_and_system_functions_and_macros.html#cvGetErrStatus

Upvotes: 3

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