Qt5.6+OpenCV3.2实现rtsp流媒体播放

怼烎@ 2022-08-29 00:26 257阅读 0赞

原文地址::[https://www.pianshen.com/article/4830356549/][https_www.pianshen.com_article_4830356549]

因为竞争对手有界面，所以我们也要做界面.................

选择了qt做界面，毕竟Linux下可选的不多。

OpenCV 用来处理视频流，还好不用处理音频，不然还要加上FFmpeg了。

Qt使用QLabel显示图片，用定时器刷新。

中间遇到了图像显示扭曲，和颜色不正确问题。

OpenCV中颜色是BGR，Qt中是RGB 需要用cvtColor转换一下；

另一点是QImage初始化，要对齐

qimg = QImage((const uchar\*)(mat.data), //(const unsigned char\*)  
mat.cols,mat.rows,  
mat.cols\*mat.channels(), //new add  
QImage::Format\_RGB888);

代码：

main.cpp

\#include "mainwin.h"  
\#include <QApplication>

int main(int argc, char \*argv\[\])  
\{  
QApplication a(argc, argv);  
MainWin w;  
w.show();

return a.exec();  
\}

mainwin.cpp

\#include "mainwin.h"  
\#include "ui\_mainwin.h"  
\#include "iostream"  
\#include <QDebug>

using namespace cv;  
using namespace std;

MainWin::MainWin(QWidget \*parent) :  
QMainWindow(parent),  
ui(new Ui::MainWin)  
\{  
ui->setupUi(this);  
video=cv::VideoCapture("rtsp://admin:mima@192.168.5.65:554/h264/ch1/sub/av\_stream");  
double rate= video.get(CV\_CAP\_PROP\_FPS);  
qDebug() << "rate:" << rate;  
\}

MainWin::~MainWin()  
\{  
delete ui;  
\}

void MainWin::on\_pushButton\_clicked()  
\{  
timer = new QTimer(this);  
connect(timer,SIGNAL(timeout()),this,SLOT(getframe()));  
timer->start(5); //为避免出现延时累积，每5毫秒刷新界面

void MainWin::getframe()  
\{  
video>>src\_frame; //从视频取帧  
if(!src\_frame.data)timer->stop();//如果取不到数据，终止计时器

Size dsize = Size(ui->label\_left\_in->width(),  
ui->label\_left\_in->height());  
cv::resize(src\_frame, src\_frame, dsize );

if(src\_frame.channels() == 3) \{ // RGB image  
cvtColor(src\_frame,src\_frame,CV\_BGR2RGB);  
qimg = QImage((const uchar\*)(src\_frame.data), //(const unsigned char\*)  
src\_frame.cols,src\_frame.rows,  
src\_frame.cols\*src\_frame.channels(), //new add  
QImage::Format\_RGB888);  
\}else \{ // gray image  
qimg = QImage((const uchar\*)(src\_frame.data),  
src\_frame.cols,src\_frame.rows,  
src\_frame.cols\*src\_frame.channels(), //new add  
QImage::Format\_Indexed8);  
\}  
//ui->label->clear();  
ui->label\_left\_in->setPixmap(QPixmap::fromImage(qimg));  
\}

mainwin.h

\#ifndef MAINWIN\_H  
\#define MAINWIN\_H

\#include <QMainWindow>  
\#include <opencv2/core/core.hpp>  
\#include <opencv2/highgui/highgui.hpp>  
//\#include <opencv2/core.hpp>  
//\#include <opencv2/highgui.hpp>  
//\#include <opencv2/imgproc.hpp>  
\#include <opencv2/imgproc/imgproc.hpp>  
\#include <QTimer>

namespace Ui \{  
class MainWin;  
\}

class MainWin : public QMainWindow  
\{  
Q\_OBJECT

public:  
explicit MainWin(QWidget \*parent = 0);  
~MainWin();

private:  
Ui::MainWin \*ui;  
cv::VideoCapture video;  
cv::Mat src\_frame;  
QTimer \*timer;  
QImage qimg;

private slots:  
void getframe();  
void on\_pushButton\_clicked();  
\};

\#endif // MAINWIN\_H

结果：

![d0bb487ab367098f51506ec1b4345a86.png][]

[https_www.pianshen.com_article_4830356549]: https://www.pianshen.com/article/4830356549/
[d0bb487ab367098f51506ec1b4345a86.png]: /images/20220829/2d8633ccbe164379ac1806aa2727592a.png