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When i execute code:

VideoCapture cap("filename.avi"); // open the default camera
if(!cap.isOpened())  // check if we succeeded
     return -1;

i always get error that file is not open. Where i can get type of error, error message string? OS Kubuntu, opencv2

When i execute code:

VideoCapture cap("filename.avi"); // open the default camera
if(!cap.isOpened())  // check if we succeeded
     return -1;

i always get error that file is not open. Where i can get type of error, error message string? OS Kubuntu, opencv2