Question

我想在qt无框窗口中显示gstreamer视频。 我正在为其创建代码的gstreamer管道是：
gst-launch-1.0 -v rtspsrc location = rtsp：//192.168.1.15：8554 / test！ rtpjitterbuffer！ rtph264depay！ avdec_h264！ d3dvideosink sync = false
这是我的第一个问题，请回答我。我的代码如下我的代码正在为qt窗口工作。它显示了它正在接收的视频来自rtsp链接，但我有两个主要问题：
1。当我最小化此窗口时，它会丢失它的输出视频并开始显示空白屏幕。
2.我想在无框窗口中打开这个视频但是如果我这样做则它什么也没显示。

我正在使用Qt-4.8.12和gstreamer版本1.4.5 for Windows 7 64位。关于这两个问题的任何帮助都非常感谢。在此先感谢。

＆＃13;

#include <glib.h>
#include <gst/gst.h>
#include <gst/video/videooverlay.h>

#include <QApplication>
#include <QTimer>
#include <QWidget>
#include <stdio.h>
#include "qmainwindow.h"


static void on_pad_added (GstElement *element, GstPad *pad, gpointer data);
static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data);
int main(int argc, char *argv[])
{
  

  if (!g_thread_supported ())
    g_thread_init (NULL);

  /* Initialize GStreamer */


  gst_init (&argc, &argv);
  QApplication app(argc, argv);
  app.connect(&app, SIGNAL(lastWindowClosed()), &app, SLOT(quit ()));

  /* Creating Elements */

  //GstElement *pipeLine = gst_pipeline_new ("xvoverlay");

 QWidget window;
 // QMainWindow window;
  window.resize(1024,768);
  WId xwinid=window.winId();
  
  GMainLoop *loop;

  GstElement *pipeLine, *rtspSrc, *rtpJitterBuffer, *rtpH264Depay, *avDecH264, *videoSink;

  rtspSrc =  gst_element_factory_make("rtspsrc", NULL);

  rtpJitterBuffer =  gst_element_factory_make("rtpjitterbuffer", NULL);

  rtpH264Depay =  gst_element_factory_make("rtph264depay", NULL);

  avDecH264 = gst_element_factory_make("avdec_h264", NULL);

  videoSink =  gst_element_factory_make("d3dvideosink", NULL);

  loop = g_main_loop_new (NULL, FALSE); 

  if (!rtspSrc || !rtpJitterBuffer || !rtpH264Depay || !avDecH264 || !videoSink) 
  {
        g_printerr ("Not all elements could be created.\n");
        return -1;
  }
  

  /* Set element properties */

   g_object_set( rtspSrc, "location", "rtsp://192.168.1.16:8554/test" , NULL);
   g_object_set( videoSink, "sync", false, NULL);
  
   /*Initializing Pipeline*/

   pipeLine = gst_pipeline_new ("TestPipeLine");

   if (!pipeLine) 
   {
	   g_printerr ("Pipeline could not be created.");
   }

   /* we add a message handler */ 
  GstBus *bus = gst_pipeline_get_bus (GST_PIPELINE (pipeLine)); 
  gst_bus_add_watch (bus, bus_call, loop); 
  gst_object_unref (bus); 


   /*Adding Components to the pipeline */

   gst_bin_add_many (GST_BIN(pipeLine),
                        rtspSrc,
						rtpJitterBuffer,
                        rtpH264Depay,
                        avDecH264,
                        videoSink,
                        NULL);
/*   if (gst_element_link (rtspSrc, rtpJitterBuffer) != TRUE) 
   {
        g_printerr ("rtspSrc & rtpJitterBuffer could not be linked.\n");
        gst_object_unref (pipeLine);
        return -1;
   }
*/
   

   if (gst_element_link (rtpJitterBuffer, rtpH264Depay) != TRUE) 
   {
        g_printerr ("rtpJitterBuffer and rtpH264Depay could not be linked.\n");
        gst_object_unref (pipeLine);
        return -1;
   }
   
   if (gst_element_link (rtpH264Depay, avDecH264) != TRUE) 
   {
        g_printerr ("rtpH264Depay and avDecH264 could not be linked.\n");
        gst_object_unref (pipeLine);
        return -1;
   }
   if (gst_element_link (avDecH264, videoSink) != TRUE) 
   {
        g_printerr ("avDecH264 and videoSink could not be linked.\n");
        gst_object_unref (pipeLine);
        return -1;
   }

   g_signal_connect (rtspSrc, "pad-added", G_CALLBACK (on_pad_added), rtpJitterBuffer);
       window.setWindowFlags(Qt::FramelessWindowHint);
  // else
	//   g_printerr("Pipeline created");zz
   gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY(videoSink), guintptr(xwinid));

   window.show();
  
   /* Set the pipeline to "playing" state*/ 
  g_print ("Now playing: %s\n", argv[1]); 
  gst_element_set_state (pipeLine, GST_STATE_PLAYING); 
    app.exec();

  /* Iterate */ 
  g_print ("Running...\n"); 
  g_main_loop_run (loop); 
  

  /* Out of the main loop, clean up nicely */ 
  g_print ("Returned, stopping playback\n"); 
  gst_element_set_state (pipeLine, GST_STATE_NULL); 
  
  g_print ("Deleting pipeline\n"); 
  gst_object_unref (GST_OBJECT (pipeLine)); 

  return 0; 

}

static void on_pad_added (GstElement *element, GstPad *pad, gpointer data) 
{ 
  GstPad *sinkpad; 
  GstElement *decoder = (GstElement *) data; 

  /* We can now link this pad with the vorbis-decoder sink pad */ 
  g_print ("Dynamic pad created, linking demuxer/decoder\n"); 

  sinkpad = gst_element_get_static_pad (decoder, "sink"); 

  gst_pad_link (pad, sinkpad); 

  gst_object_unref (sinkpad); 
} 

static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data) 
{ 
  GMainLoop *loop = (GMainLoop *) data; 

  switch (GST_MESSAGE_TYPE (msg)) { 

    case GST_MESSAGE_EOS: 
      g_print ("End of stream\n"); 
      g_main_loop_quit (loop); 
      break; 

    case GST_MESSAGE_ERROR: { 
      gchar  *debug; 
      GError *error; 

      gst_message_parse_error (msg, &error, &debug); 
      g_free (debug); 

      g_printerr ("Error: %s\n", error->message); 
      g_error_free (error); 

      g_main_loop_quit (loop); 
      break; 
    } 
    default: 
      break; 
  } 

  return TRUE; 
}

＆＃13;

Answer 1

如果您切换回使用QWindow，这将起作用：

window.setWindowFlags (Qt::FramelessWindowHint);

我不确定如何，但我认为类似的东西可用于QWidget。

如何在Qt无框窗口中显示GStreamer视频？

1 个答案: