How to display RTSP Stream using QT? I already used LibVlc-QT for display, but i didn't get control over stream after using this library. So I don't want to use LibVlC QT.

[kuber saini]

Hi,
I want to display RTSP stream using QT. I am using DSS for as a streaming server. Now I want to display that stream on Qt.

[tomasz3dk]

Hi, and welcome. Maybe gstreamer will be better for your solution.

[kuber saini]

Thanks tomasz3dk,
You mean to replace Qt with GStreamer to display the streaming video?
or to use GStreamer instead of DSS for streaming?

[tomasz3dk]

I mean replace libVLC with gstreamer.

[kuber saini]

I got sample code to play RTSP stream using Gstreamer. Here is the code:

#include <gst/gst.h>

int main(int argc, char *argv[])
{
GstElement *pipeline;
GstBus *bus;
GstMessage *msg;

/* Initialize GStreamer */
gst_init (&argc, &argv);

/* Build the pipeline */
pipeline = gst_parse_launch ("playbin2 uri=rtsp://172.19.91.21/channel.sdp", NULL);

/* Start playing */
gst_element_set_state (pipeline, GST_STATE_PLAYING);

/* Wait until error or EOS */
bus = gst_element_get_bus (pipeline);
msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);

/* Free resources */
if (msg != NULL)
gst_message_unref (msg);
gst_object_unref (bus);
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
return 0;
}

But using this code, I can not display my stream data on Qt GUI.
I have created GUI using Qt and now i want to display this RTSP stream on that Qt's GUI. So I feel this code is not useful to do that.

[tomasz3dk]

On which platform plugin are you running this code (eglfs, xcb,) ? Also there are Qt bindings for gstreamer, that you can use in your project: Qt gstreamer.

[kuber saini]

I am using ubuntu trusty image on iMX6 Board (Nitrogen 6 Max). I am trying to build and code using QtGstreamer library. Will post here once I done with it.
Thanks tomaz3dk.

[kuber saini]

So finally I am able to display live RTSP Stream on QT's surface(Qt Widgets). Here is the sample code:

// Sample code to play rtsp stream on qt widgets
int main(int argc, char *argv[])
{
      gst_init (&argc, &argv);
      QApplication app(argc, argv);
      app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));

      // prepare the pipeline
      GstElement *pipeline = gst_parse_launch ("playbin uri=rtsp://172.19.91.21/channel.sdp", NULL);

      // prepare the ui
      QWidget window;
      window.setWindowTitle("MyWidget");
      window.resize(640, 480);
      window.show();

      WId xwinid = window.winId();
      //this is the call to overlay the gstreamer's output to the Qt Widgets...
      gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (pipeline), xwinid);


      // run the pipeline
      GstStateChangeReturn sret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
      if (sret == GST_STATE_CHANGE_FAILURE)
      {
        gst_element_set_state (pipeline, GST_STATE_NULL);
        gst_object_unref (pipeline);
        // Exit application
        QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
      }

      int ret = app.exec();

      window.hide();
      gst_element_set_state (pipeline, GST_STATE_NULL);
      gst_object_unref (pipeline);

      return ret;
}

Thanks tomaz3dk.

[tomasz3dk]

No problem ;) Just for explanation. This code will work only in xcb platfrom and not with eglfs. BTW you missed "s" in my nick it's "tomasz3dk", not "tomaz3dk".

[kuber saini]

oops.. Sorry for the name.
Actually I am developing my application for Ubuntu and right now no plan to port on other platform. But If I face any problem I will post here.. :D
Thanks tomasz3dk :)

[Ranjeet Dhumal]

kuber saini using activeWindow() to capture frames for RTSP streaming, but when the HDMI cable is removed, no frames are sent.