I am using CV::VideoCapture to capture frames from an IP camera. It works most of time, however, sometimes it reports the error:
[mjpeg @ 0x233aea0] overread 8
And when this error occurred, my program just stuck there. This might explain why. But how can I solve it in C++ code? Can OpenCV handle this error without terminate the program?
p.s. I found that if I didn't call CV::VideoCapture::read() immediately, but wait for a while, like 60 seconds, after CV::VideoCapture::open(), this error occurred everytime! Is it a bug of OpenCV?
#include <unistd.h>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
int main(int argc, char* argv[]) {
// argv[1] is a valid url, like "http://xxxx/mjpg/video.mjpg"
cv::VideoCapture cap(argv[1]);
if (!cap.isOpened()) {
std::cout << "Cannot Open Camera!" << std::endl;
return -1;
}
// The error occures if I pause for a while.
// But it is okay when I capture frames from video files intead of IP camera.
sleep(60);
while (static_cast<char>(cv::waitKey(1)) != 'q') {
cv::Mat frame;
cap >> frame;
if (frame.empty()) break;
cv::imshow("frame", frame);
}
}
