使用 OpenCV 播放视频以校正速度 [英] Playing video to correct speed with OpenCV

问题描述

我在播放视频文件时遇到问题，为什么它是慢动作?我怎样才能让它正常速度?

I have problem with plying video file, why it is slow motion ? How can I make it normal speed?

#include"opencv2/opencv.hpp" 
using namespace cv; 

int main(int, char**) 
{ 
    VideoCapture cap("eye.mp4"); 
    // open the default camera 
    if (!cap.isOpened()) 
        // check if we succeeded 
        return -1; 

    namedWindow("Video", 1); 
    while (1) 
    { 
        Mat frame; 
        cap >> frame; 
        imshow("Video", frame); 
        if (waitKey(10) == 'c') 
            break; 
    } 
    return 0; 
}

推荐答案

VideoCapture 不是为播放而构建的，它只是一种从视频文件或相机中抓取帧的方法.其他支持播放的库，例如 GStreamer 或 Directshow，它们设置了一个控制播放的时钟，以便可以将其配置为尽可能快地播放或使用原始帧率.

VideoCapture isn't built for playback, it's just a way to grab frames from video file or camera. Other libraries that supports playback, such as GStreamer or Directshow, they set a clock that control the playback, so that it can be configured to play as fastest as possible or use the original framerate.

在您的代码段中，帧之间的间隔来自读取帧所需的时间和 waitKey(10).尝试使用 waitKey(0)，它至少应该播放得更快.理想情况下，您可以使用 waitKey(1/fps).

In your snippet, the interval between frames comes from the time it takes to read a frame and the waitKey(10). Try using waitKey(0), it should at least play faster. Ideally, you could use waitKey(1/fps).

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