因其工作需要使用C++读取rtsp流，本文将针对linux下c++版读取视频流保存视频，凌乱且各种错误。现将将其成功执行的流程和代码记录，顺带也写了一份python读取rtsp方法，供自己使用及有需之人参考。本文分三部分，第一部分呈现CMakeLists.txt与rtsp_video源码；第二部分插图给出使用方法；第三部分顺带给出python方法的源码。

 一.CMakeLists.txt与rtsp_video源码

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)

project(rtsp)

find_package( OpenCV REQUIRED )
include_directories( ${OpenCV_INCLUDE_DIRS} )
 
add_executable(rtsp_demo rtsp_video.cpp)

target_link_libraries( rtsp_demo ${OpenCV_LIBS} )

rtsp_video.cpp

#include <iostream>
#include <opencv2/core/core.hpp> 
#include<opencv2/highgui/highgui.hpp> 
#include <opencv2/opencv.hpp>
using namespace cv;
using namespace std;
int main() {
    std::string rtspPath = "rtsp://admin:Vrc123456@192.168.2.226:554";
    VideoCapture cap;
    cap.open(rtspPath);
    if (!cap.isOpened())
    {
        cout << "cannot open video!" << endl;
        return 0;
    }
    VideoWriter writer = VideoWriter("./rtsp-video.avi",//path and filename
        (int)cap.get(CAP_PROP_FOURCC),
        (int)cap.get(CAP_PROP_FPS),
        Size((int)cap.get(CAP_PROP_FRAME_WIDTH),
            (int)cap.get(CAP_PROP_FRAME_HEIGHT)),
        true//colorfull pic
    );
    if (!writer.isOpened()) {
        cout << "create vedio failed!" << endl;
        return 0;
    }
    while (1)
    {
        cv::Mat frame;
        cap >> frame;
        if (frame.empty())
        {
            cout << "frame is empty!" << endl;
            break;
        }      
        cv::Mat img = frame;
        //cv::imshow("frame", img);
        writer<<img;
        //waitKey(1);        
    }  
    return 0;
}

注：opencv安装参考网络方法

二.使用方法

步骤1：

打开rtsp_video.cpp文件修改流接口：

std::string rtspPath = "rtsp://admin:Vrc123456@192.168.2.226:554";

步骤2：

将整个文件夹传入需编译服务器，文件内容包括红框内容：

以下类似编译过程

步骤3：执行

cmake  .

make

可出现rtsp_demo，以下红框

无需录视频，执行 ctrl+c 按键

保存视频为rtsp-video.avi

三.python方法的源码

import cv2
cap = cv2.VideoCapture('rtsp://admin:Vrc123456@192.168.2.226:554')
fourcc = cv2.VideoWriter_fourcc(*'XVID')
size = (int(cap.get(cv2.CAP_PROP_FRAME_WIDTH)), int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT)))
out = cv2.VideoWriter('./rtsp_video.avi', fourcc,10.0, size)
while True:
    ret, frame = cap.read()
    out.write(frame)

    cv2.imshow('frame', frame)
    cv2.waitKey(1)

cap.release()
out.release()
cv2.destroyAllWindows()