Problem with OpenCV camera calibration from video file

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It's a bug in calibrate_camera. At line 104 in calibrate_camera.cpp, it's calling readStringList with the name of the video file. Attempting to parse the video file as an xml file gets you that error.

I had the same issue. This is because OpenCV tries to open the video file as an xml file and crashes. I modified my readStringList function with a try-catch and it works for me:

static bool readStringList(const string& filename, vector<string>& l) {
    l.clear();
    FileStorage fs;
    try {
      fs.open(filename, FileStorage::READ);
    } catch (...) {
      return false;
    }
    if (!fs.isOpened()) return false;
    FileNode n = fs.getFirstTopLevelNode();
    if (n.type() != FileNode::SEQ) return false;
    FileNodeIterator it = n.begin(), it_end = n.end();
    for (; it != it_end; ++it) l.push_back((string)*it);
    return true;
  }