use appsink instead of videosink

videoviewerwidget.h

@@ -6,7 +6,9 @@
 #include <QComboBox>
 #include <QLineEdit>
 #include <QLabel>
+#include <QImage>
 #include <gst/gst.h>
+#include <gst/app/gstappsink.h>
 
 class VideoViewerWidget : public QWidget
 {
@@ -16,13 +18,14 @@ public:
     explicit VideoViewerWidget(QWidget *parent = nullptr);
     ~VideoViewerWidget();
 
-protected:
-    void showEvent(QShowEvent* event) override;
+signals:
+    void newFrameAvailable(const QImage& frame);
 
 private slots:
     void onStartViewer();
     void onStopViewer();
     void onSourceTypeChanged(int index);
+    void displayFrame(const QImage& frame);
 
 private:
     void setupUI();
@@ -31,13 +34,12 @@ private:
     void startPipeline();
     void stopPipeline();
     QString buildPipelineString();
-    void setupVideoOverlay();
 
     static gboolean busCallback(GstBus* bus, GstMessage* msg, gpointer data);
-    static void onPrepareWindowHandle(GstBus* bus, GstMessage* msg, gpointer data);
+    static GstFlowReturn newSampleCallback(GstAppSink* appsink, gpointer user_data);
 
     // UI elements
-    QWidget* m_videoContainer;
+    QLabel* m_videoDisplay;
     QPushButton* m_startBtn;
     QPushButton* m_stopBtn;
     QComboBox* m_sourceType;
@@ -47,9 +49,8 @@ private:
 
     // GStreamer elements
     GstElement* m_pipeline;
-    GstElement* m_videoSink;
+    GstElement* m_appSink;
     guint m_busWatchId;
-    WId m_windowId;
 };
 
 #endif // VIDEOVIEWERWIDGET_H