CODEWITHSUNDEEP
c++visual-studio-2008videoopencv
Jason
Jason

Reputation: 13956

OpenCV VideoCapture not working outside Visual Studio

I'm using VideoCapture capture(filename); to load a video from a file. When I run the program in visual studio (release mode), it works just fine, loading the video like I would expect. When I run outside of visual studio (by double-clicking the icon in the explorer directory) the video cannot be found and the capture device returns null, even though it's the same file and paths are hardcoded and absolute.

Any ideas?

Update: Also tried using the old CvCapture* and same error.

Update 6/19:

Here's some example code. 

#include "opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace std;
using namespace cv;

int main(int argc, char** args)
{
    const char* filename = "c:/testvideo.wmv";

    //Check to see if we can see the file
    FILE* myFile = fopen(filename, "r");
    if (myFile)
        cout<<"0: Found file"<<endl;
    else
        cout<<"0: File not found"<<endl;

    //First use the openCV new way of doing it
    VideoCapture capture1(filename);

    if (capture1.isOpened())
        cout<<"1: Opened the video successfully"<<endl;
    else
        cout<<"1: Could not open the video"<<endl;

    //Second, try the old way
    CvCapture* capture2 = cvCaptureFromFile(filename);
    if (capture2)
        cout<<"2: Opened the video successfully"<<endl;
    else
        cout<<"2: Could not open the video"<<endl;

    //Pause
    char c;
    cin>>c;

    return 0;
}

In Visual Studio running in release mode I get: 

0: File Found
1: Opened the video successfully
2: Opened the video successfully

Running from the exe from the file system (double-clicking) I get:

0: File Found
1: Could not open the video
2: Could not open the video

I only compiled once, so there's only one exe in the directory... I've also tried displaying the frames in Visual Studio, so I know it's actually really reading the video when it thinks it's open.

Upvotes: 1

Views: 1259

Answers (2)

XYZ
XYZ

Reputation: 51

Make sure that you use absolute video path (if not, Try to copy video into exe path) and if you are using release mode, all dlls must be in the release mode. Maybe I will solve this problem if you send me a small project.

Upvotes: 1

RvdK
RvdK

Reputation: 19790

Check if all the DLL's that are required are in the same folder as your exe (or in PATH)

Upvotes: 1

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