c++ - 如何从视频中选择两帧？ opencv C++

Question

我想从视频中选择两帧。以下是我的代码，但它只能选择第一帧。有人可以帮我吗？谢谢~

long frameOne = 2130;
long frameTwo = 2160;
long currentFrame = frameOne;
bool stop = false;
while(!stop)
{
    if(!capture.read(frame))
    {
        cout << "Failed to read the video!" << endl;
        return -1;
    }

    // select the first image
    if(currentFrame == frameOne)
    {
        frame1 = frame;
    }
    if(currentFrame == frameTwo)
    {
        frame2 = frame;
    }

    if(currentFrame>frameTwo)
    {
          stop = true;
    }
    currentFrame++;
}

Answer 1

这里的问题是

long currentFrame = frameOne;

应该是

long currentFrame = 1;

代码:

long frameOne = 2130;
long frameTwo = 2160;
long currentFrame = 1;
bool stop = false;
while(!stop)
{    

    if(!capture.read(frame))
    {
        cout << "Failed to read the video!" << endl;
        return -1;
    }

    // select the first image
    if(currentFrame == frameOne)
    {
        // it needs a deep copy, since frame points to the static capture mem
        frame1 = frame.clone();
    }
    if(currentFrame == frameTwo)
    {
        frame2 = frame.clone();
    }

    if(currentFrame>frameTwo)
    {
          stop = true;
    }
    currentFrame++;
}