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just go with the inRange() function since it is more convenient:

Mat mask;
cv::Scalar lowRange = cv::Scalar(0, 0, 0);
cv::Scalar upperRange = cv::Scalar(0, 0, 0);
cv::inRange(frame, lowRange, upperRange, mask); // if the frame has any black pixel, this will be painted in the mask as white

if(countNonZero(mask) = 0) // no black pixels we keep the frame
{
    Mat frame1 = frame.clone();
    imshow("Output", frame1);
    out.write(frame1);
}

just go with the inRange() function since it is more convenient:

Mat mask;
cv::Scalar lowRange lowerb = cv::Scalar(0, 0, 0);
cv::Scalar upperRange upperb = cv::Scalar(0, 0, 0);
cv::inRange(frame, lowRange, upperRange, lowerb, upperb, mask); // if the frame has any black pixel, this will be painted in the mask as white

if(countNonZero(mask) = 0) // no black pixels we keep the frame
{
    Mat frame1 = frame.clone();
    imshow("Output", frame1);
    out.write(frame1);
}

just go with the inRange() function since it is more convenient:

Mat mask;
cv::Scalar lowerb = cv::Scalar(0, 0, 0);
cv::Scalar upperb = cv::Scalar(0, 0, 0);
cv::inRange(frame, lowerb, upperb, mask); // if the frame has any black pixel, this will be painted in the mask as white

imshow("mask", mask); // show where black pixels are located
if(countNonZero(mask) = == 0) // no black pixels we keep the frame
{
   cout << "frame does not have black pixels!!!!" << endl;
 Mat frame1 = frame.clone();
  // do whatever you want with the frame
}else{
 imshow("Output", frame1);
cout << "frame has black pixels!!!" << endl;
 out.write(frame1);
// skip frame
}

edit: I transformed it to an answer since I could not edit my comment. Now it should be ok.

just go with the inRange() function since it is more convenient:

Mat mask;
cv::Scalar lowerb = cv::Scalar(0, 0, 0);
cv::Scalar upperb = cv::Scalar(0, 0, 0);
cv::inRange(frame, lowerb, upperb, mask); // if the frame has any black pixel, this will be painted in the mask as white

imshow("mask", mask); // show where black pixels are located
located, visualization reason only
if(countNonZero(mask) == 0) // no black pixels we keep the frame
{
   cout << "frame does not have black pixels!!!!" << endl;
   // do whatever you want with the frame
}else{
    cout << "frame has black pixels!!!" << endl;
    // skip frame
}