Hello,

I'm trying to create a QT program to display the mjpg frames of my ip camera. For this i used QHttp without succes. On the internet i found out that it was also possible with QNetworkAccessManager. Now i've managed to show single images by using QNetworkReply and put it in a QPixmap. I'm sure it als must be possible for mjpg images but i can't figure out how.

Can anyone give me some advise. I can't use Opencv because finaly the application has to be written in QT embedded. If i'm right, i have to use the virtual framebuffer to show the mjpg images of the camera.

Below you can see my code.

Qt Code: 
  1. MainWindow::MainWindow(QWidget *parent) :
  2.     QMainWindow(parent),
  3.     ui(new Ui::MainWindow)
  4. {
  5.     ui->setupUi(this);
  6.     m_netwManager = new QNetworkAccessManager(this);
  7.     connect(m_netwManager, SIGNAL(finished(QNetworkReply*)), this, SLOT(slot_netwManagerFinished(QNetworkReply*)));
  8.     connect(m_netwManager,SIGNAL(authenticationRequired(QNetworkReply*,QAuthenticator*)),this,SLOT(slot_netwManagerFinished(QNetworkReply*,QAuthenticator*)));
  9. }
  10.  
  11. void MainWindow::on_action_Download_triggered()
  12. {
  13.     QUrl url(ui->txtImageAddress->text());
  14.     QNetworkRequest request(url);
  15.     m_netwManager->get(request);
  16. }
  17.  
  18. void MainWindow::slot_netwManagerFinished(QNetworkReply*,QAuthenticator* auth)
  19. {
  20.     auth->setUser("admin");
  21.     auth->setPassword("admin");
  22. }
  23.  
  24. void MainWindow::slot_netwManagerFinished(QNetworkReply *reply)
  25. {
  26.  
  27.     if (reply->error() != QNetworkReply::NoError) {
  28.         reply->deleteLater();
  29.         return;
  30.     }
  31.  
  32.     QString contentType = reply->header( QNetworkRequest::ContentTypeHeader ).toString();
  33.  
  34.     if (contentType == "image/jpeg")
  35.     {
  36.  
  37.         QVariant redir = reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
  38.         if (redir.isValid()) {
  39.             QUrl url = redir.toUrl();
  40.             if (url.isRelative()) {
  41.                 url.setScheme(reply->url().scheme());
  42.                 url.setEncodedHost(reply->url().encodedHost());
  43.             }
  44.             QNetworkRequest req(url);
  45.             m_netwManager->get(req);
  46.             reply->deleteLater();
  47.             return;
  48.         }
  49.  
  50.         QByteArray jpegData = reply->readAll();
  51.  
  52.         QPixmap pixmap;
  53.         pixmap.loadFromData(jpegData);
  54.         ui->lblImage->setPixmap(pixmap);
  55.  
  56.         reply->deleteLater();
  57.  
  58.     }
  59.     else
  60.     {
  61.        //VIDEO MJPG DATA
  62.  
  63.  
  64.     }
  65. }
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