C ++ OpenCV获取编码的网络摄像头流 [英] c++ opencv get encoded webcam stream

问题描述

我目前正在从事一个项目，该项目从网络摄像头捕获视频并通过UDP发送编码后的流以进行实时流式传输.

I am currently work on a project that capture video from webcam and send the encoded stream via UDP to do a real time streaming.

#include "opencv2/highgui/highgui.hpp"
#include <iostream>

using namespace cv;
using namespace std;

int main(int argc, char* argv[])
{
VideoCapture cap(0); // open the video camera no. 0

double dWidth = cap.get(CV_CAP_PROP_FRAME_WIDTH); //get the width of frames of the video
double dHeight = cap.get(CV_CAP_PROP_FRAME_HEIGHT); //get the height of frames of the video

while (1)
{
    Mat frame;

    bool bSuccess = cap.read(frame); // read a new frame from video

if (!bSuccess) //if not success, break loop
{
cout << "Cannot read a frame from video stream" << endl;
break;
}
return 0;
}

有人说从 cap.read(frame)获得的帧已经是解码的帧，我不知道它是如何发生的以及何时发生的.我想要的是编码的帧或流.我应该怎么做才能得到它?我应该再编码一次吗?

Some people say that the frame get from cap.read(frame) is already the decoded frame,I have no idea how and when does that happen. And what I want is the encoded frame or stream. What should I do to get it? Should I encoded it back again?

推荐答案

根据

According to the docs, calling VideoCapture::read() is equivalent to calling VideoCapture::grab() then VideoCapture::retrieve().

Retrieve函数的文档说它确实对帧进行了解码.

The docs for the Retrieve function say it does indeed decode the frame.

为什么不仅仅使用解码帧?大概在任何情况下，您都将在远端对其进行解码?

Why not just use the decoded frame; presumably you'd be decoding it at the far end in any case?

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