CODEWITHSUNDEEP
c++opencv
xOtik
xOtik

Reputation: 21

Catch/Suppress OpenCV warnings sent to std::cout

When a camera is attached AND you supply VideoCapture with an unmapped int DeviceID, OpenCV outputs (to std::cout, mind you) Unable to stop the stream: Invalid argument.

How can I catch/suppress this?

Upvotes: 2

Views: 861

Answers (1)

Dan Mašek
Dan Mašek

Reputation: 19041

You can use the cv::redirectError function to handle any messages (such as asserts) yourself. For example, to simply silence the output, you could use the following piece of code:

#include <opencv2/opencv.hpp>

int dummy_error_handler(int status
    , char const* func_name
    , char const* err_msg
    , char const* file_name
    , int line
    , void* userdata)
{
    //Do nothing -- will suppress console output
    return 0;   //Return value is not used
}

void set_dummy_error_handler()
{
    cv::redirectError(dummy_error_handler);
}

void reset_error_handler()
{
    cv::redirectError(nullptr);
}

Note: If the actual message comes from another source, such as a third party library that OpenCV uses, a different approach will be necessary.

Upvotes: 2

Related Questions