Fix false positive no frames detection for Qt6VideoSink.

Author: Mysticial

SerialPrograms/Source/CommonFramework/VideoPipeline/Backends/CameraWidgetQt6.cpp

@@ -162,6 +162,7 @@ CameraVideoSource::CameraVideoSource(
             WallClock now = current_time();
             {
                 WriteSpinLock lg(m_frame_lock);
+//                cout << now << endl;
                 m_last_frame = frame;
                 m_last_frame_timestamp = now;
                 uint64_t seqnum = m_last_frame_seqnum.load(std::memory_order_relaxed);

SerialPrograms/Source/CommonFramework/VideoPipeline/VideoSession.cpp

@@ -210,16 +210,16 @@ double VideoSession::fps_display() const{
 }
 void VideoSession::on_frame(std::shared_ptr<const VideoFrame> frame){
     m_frame_listeners.run_method_unique(&VideoFrameListener::on_frame, frame);
-    WriteSpinLock lg(m_fps_lock);
-    m_fps_tracker_source.push_event(frame->timestamp);
-}
-void VideoSession::on_rendered_frame(WallClock timestamp){
     {
         WriteSpinLock lg(m_fps_lock);
-        m_fps_tracker_rendered.push_event(timestamp);
+        m_fps_tracker_source.push_event(frame->timestamp);
     }
     global_watchdog().delay(*this);
 }
+void VideoSession::on_rendered_frame(WallClock timestamp){
+    WriteSpinLock lg(m_fps_lock);
+    m_fps_tracker_rendered.push_event(timestamp);
+}
 
 
 void VideoSession::on_watchdog_timeout(){