HOG Detection : Webcam unable to grab new frame - opencv

Question

I have the following code to get a video feed from a network cam and subsequently perform a HOG detection.
However, when i add the HOG detection code , the code is only able to grab the first image upon running and it doesnt refresh on subsequent iteration. I have checked, using breakpoint, that the program is continuously running.
Please advise. Thank you.
void doDetection(void){
VideoCapture cap("http://user:password#10.0.0.1/mjpg/video.mjpg");
if (!cap.isOpened())
return;
HOGDescriptor hog;
hog.setSVMDetector(HOGDescriptor::getDefaultPeopleDetector());
while (true)
{
Mat img, mono_img;
bool status = cap.read(img);
if (status == false) break;
vector<Rect> found, found_filtered;
cvtColor(img, mono_img, CV_BGR2GRAY);
equalizeHist(mono_img, mono_img);
// this is the problem statement , when removed this program refresh fine
hog.detectMultiScale(mono_img, found, 0, Size(8, 8), Size(50, 50), 1.05, 2);
imshow("Show", img);
if (waitKey(20) >= 0)
break;
}
}

Answer 1

I have found this to happen even when you pause the execution of the code for a little while.
In my case MJPEG OVERREAD would appear in the console, after which no more images would get grabbed from the stream, but the stream would still be `open´
I build this little check around this problem which resets the capture. just place this in your WHILE
if (cap.isOpened())
{
cap.read(img);
if (img.rows == 0)
{
cap.release();
cap.open("");//Insert own url
cap.read(img);
}
}
else
{
cap.open(""); //Insert own url
cap.read(img);
}
if this "solves" the problem by keeping you app running, you should capture the frames on a separate thread to prevent the stream from dying like this.
If this does not "solve" the problem, I'm not sure what else could be wrong