Building video player using Qt and gstreamer at the backend

[XMAN]

hi! i am unable to display the gstreamer video window at central window of the dock window

this my code

videowindow.cpp

@videoWindow::videoWindow(QWidget *parent) :
QWidget(parent)
{
gst_init(NULL,NULL);

pipeline=gst_pipeline_new("my_pipeline");
bin=gst_bin_new("my_bin");
src=gst_element_factory_make("v4l2src","source");
sink=gst_element_factory_make("xvimagesink",NULL);
QLabel *label=new QLabel;



/*First add the elements to the bin */
  gst_bin_add_many(GST_BIN(bin),src,sink,NULL);
  /* add  bin to the pipeline*/
   gst_bin_add(GST_BIN(pipeline),bin);
    /*link the elemnets */
   gst_element_link(src,sink);

   gst_element_set_state(sink,GST_STATE_READY);
   QApplication::syncX();
   //GstXOverlayClass::gst_x_overlay_set_window_handle(GST_X_OVERLAY(sink),window.winId());
   gst_x_overlay_set_xwindow_id(GST_X_OVERLAY(sink),label->winId());
   //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()));
   }
  // label->hide();

}
videoWindow::~videoWindow()
{
gst_element_set_state(pipeline,GST_STATE_NULL);
gst_object_unref(pipeline);

}@

mainwindow.cpp

@MainWindow::MainWindow()
{
//textEdit= new QTextEdit;
videoWindow *videowindow=new videoWindow;
setCentralWidget(videowindow);

createActions();
createMenus();
createToolBars();
createStatusBar();
createDockWindows();

setWindowTitle(tr("Dock Widgets"));

}

void MainWindow::newLetter()
{
}

void MainWindow::print()
{

}

void MainWindow::save()
{

}

void MainWindow::undo()
{

void MainWindow::about()
{

}

void MainWindow::createActions()
{

}

void MainWindow::createMenus()
{

}

void MainWindow::createToolBars()
{
fileToolBar = addToolBar(tr("File"));
fileToolBar->addAction(newLetterAct);
fileToolBar->addAction(saveAct);
fileToolBar->addAction(printAct);

editToolBar = addToolBar(tr("Edit"));
editToolBar->addAction(undoAct);

}

void MainWindow::createStatusBar()
{
statusBar()->showMessage(tr("Ready"));
}

void MainWindow::createDockWindows()
{
QDockWidget *dock = new QDockWidget(tr("Thumbnails"), this);
QMainWindow::setCorner(Qt::BottomRightCorner,Qt::RightDockWidgetArea);
dock->setAllowedAreas(Qt::BottomDockWidgetArea);

QString myDir="/home/sayantan/Qt_project/images";
    QFileSystemModel *model = new QFileSystemModel;
    model->setRootPath(myDir);
    QListView *Thumbnails = new QListView(dock);
    Thumbnails->setMaximumSize(800,200);
    Thumbnails->setModel(model);
    Thumbnails->setRootIndex(model->index(myDir));

dock->setWidget(Thumbnails);
addDockWidget(Qt::RightDockWidgetArea, dock);
viewMenu->addAction(dock->toggleViewAction());

dock = new QDockWidget(tr("Paragraphs"), this);
    paragraphsList = new QListWidget(dock);
    paragraphsList->addItems(QStringList()");
    dock->setWidget(paragraphsList);
    addDockWidget(Qt::RightDockWidgetArea, dock);
    viewMenu->addAction(dock->toggleViewAction());

}
@

main.cpp

@int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow w;
w.resize(800,600);
w.show();

return app.exec();

}@

code is compiling and running without any error but it is unable to display any frame..........Please help me

[secretNinja]

Would you wrap the code in @ (just before it and right after it), please :)