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I have some pretty basic code, it works fine when using a webcam (input 0) but seems to hang when trying to read frames from a video file as opposed to a webcam, any ideas?

#include <iostream>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>


using namespace cv;
using namespace std;

int main(int argc, char *argv[]) {
  VideoCapture stream(argv[1]);

  if (!stream.isOpened()) {
    cout << "cannot open file";
  }

  while (true) {
    Mat frame;
    stream.read(frame);
    imshow("preview", frame);
    if (waitKey(30) >= 0)
      break;
  }
return 0;
}