我似乎无法弄清楚我拥有的代码片段出了什么问题......由于某种原因,它不断输出超过 200 fps。我用OpenCV测试了,未处理的视频大约是30 fps。
int n_frame = 0;
Mat previous;
auto start = chrono::high_resolution_clock::now();
while (m_cap.isOpened()) {
if (n_frame % 100 == 1) {
auto end = chrono::high_resolution_clock::now();
auto time = chrono::duration_cast<chrono::seconds>(end - start);
cout << "the fps is: " << 1.0 / (static_cast<double>(time.count()) / n_frame) << endl;
//cin.ignore(1000, 'n');
}
n_frame++;
cout << "frame number: " << n_frame << endl;
Mat frame, original;
m_cap >> frame;
if (frame.empty())
break;
//do some video processing down here eg thresholding
}
我想你忘了重新初始化开始时间,这是修改后的代码,这提供了一致的 fps 值,我在笔记本电脑上测试了一下,得到了大约 33.2,我最多数到 100 帧并重新初始化所有内容,这似乎有效
int n_frame = 0;
Mat previous;
auto start = std::chrono::high_resolution_clock::now();
VideoCapture m_cap(0);
while (m_cap.isOpened()) {
n_frame++;
if (n_frame == 100) {
auto end = std::chrono::high_resolution_clock::now();
auto time = std::chrono::duration_cast<chrono::seconds>(end - start);
cout << "the fps is: " << (n_frame / static_cast<double>(time.count())) << endl;
start = end;
n_frame = 0;
}
//cout << "frame number: " << n_frame << endl;
Mat frame, original;
m_cap >> frame;
if (frame.empty())
break;
}