Question

嗨我有一段时间（1）做无限循环，有没有办法忽略前2帧？

while(1)
{
    bool bSuccess = capture.read(fullimage); // read a new frame from video

    if (!bSuccess)                          //if not success, break loop
    {
        cout << "End of video" << endl;
        destroyWindow("Original Video");
        destroyWindow("dctBlockImage");
        break;
    }

    imshow("Original Video", fullimage);    //show the frame in "Original Video" window

    FrameTo8by8(myinput,3.0);               //Proccess and algorithm

    oVideoWriter.write(dctImage);           //write video to file

    namedWindow("dctBlockImage"); 
    imshow("dctBlockImage", dctImage);      //display watermarked image


    if(waitKey(30) == 27) //wait for 'esc' key press for 30 ms. If 'esc' key is pressed, break loop
    {
        cout << "esc key is pressed by user" << endl; 
        break; 
    }
}

有没有办法跳过前2帧？

Answer 1

您可以按照评论中的说明进行操作：

capture.read(blah);
capture.read(blah);
while(true) { ... }

或者您可以添加一个计数器并使用它来跳过您想要的帧：

std::size_t cntr = 0;
while (true)
{
  // ...
  if (cntr < 2) // here you can add any condition you need
  {
    cntr++; // You can also put this where you need it; I have put it here not to increment if not needed
    continue;
  }
}

但我认为为了您的目的，最好使用BoBTFish的版本。

Answer 2

对于视频文件，您可以使用VideoCapture::set设置下一个要捕获的帧的索引，您可以使用宏CV_CAP_PROP_POS_FRAMES来设置索引。你应该在进入while（）循环之前使用它。

如何跳过前2帧？

2 个答案: