diff --git a/source/app/InputStream.cpp b/source/app/InputStream.cpp
index 7257cba..e9d0e80 100755
--- a/source/app/InputStream.cpp
+++ b/source/app/InputStream.cpp
@@ -304,6 +304,8 @@ cv::Mat InputStream::getFrameCvMat()
 
 Void InputStream::seekInput( Int new_frame_num )
 {
+  if( new_frame_num < 0 || new_frame_num >= m_uiTotalFrameNum )
+    return;
 #ifdef USE_FFMPEG
   if( m_cLibAvContext.getStatus() )
   {
diff --git a/source/app/SubWindowHandle.cpp b/source/app/SubWindowHandle.cpp
index 16a5308..5771969 100644
--- a/source/app/SubWindowHandle.cpp
+++ b/source/app/SubWindowHandle.cpp
@@ -208,15 +208,21 @@ bool SubWindowHandle::playEvent()
   return false;
 }
 
-Void SubWindowHandle::seekEvent( UInt new_frame_num )
+Void SubWindowHandle::seekAbsoluteEvent( UInt new_frame_num )
 {
   m_pCurrStream->seekInput( new_frame_num );
   refreshFrame();
 }
 
+Void SubWindowHandle::seekRelativeEvent( Bool bIsFoward )
+{
+  m_pCurrStream->seekInput( m_pCurrStream->getCurrFrameNum() + ( bIsFoward ? 1 : -1 ) );
+  refreshFrame();
+}
+
 Void SubWindowHandle::stopEvent()
 {
-  seekEvent( 0 );
+  seekAbsoluteEvent( 0 );
   return;
 }
 
diff --git a/source/app/SubWindowHandle.h b/source/app/SubWindowHandle.h
index 32c7ce7..c9ee0f3 100644
--- a/source/app/SubWindowHandle.h
+++ b/source/app/SubWindowHandle.h
@@ -67,7 +67,8 @@ public:
   Bool save();
 
   Void stopEvent();
-  Void seekEvent( UInt new_frame_num );
+  Void seekAbsoluteEvent( UInt new_frame_num );
+  Void seekRelativeEvent( Bool bIsFoward );
 
   QImage* FrameToQImage( PlaYUVerFrame* curr_frame );
 
diff --git a/source/app/plaYUVerApp.cpp b/source/app/plaYUVerApp.cpp
index 295f98f..0bb6548 100644
--- a/source/app/plaYUVerApp.cpp
+++ b/source/app/plaYUVerApp.cpp
@@ -220,11 +220,19 @@ void plaYUVerApp::playEvent()
   }
 }
 
+void plaYUVerApp::seekEvent( int direction )
+{
+  if( activeSubWindow() )
+  {
+    activeSubWindow()->seekRelativeEvent( direction > 0 ? true : false );
+  }
+}
+
 void plaYUVerApp::seekSliderEvent( int new_frame_num )
 {
   if( activeSubWindow() )
   {
-    activeSubWindow()->seekEvent( new_frame_num );
+    activeSubWindow()->seekAbsoluteEvent( (UInt)new_frame_num );
   }
 }
 
@@ -543,10 +551,17 @@ Void plaYUVerApp::createActions()
   actionVideoStop->setIcon( QIcon( style()->standardIcon( QStyle::SP_MediaStop ) ) );
   connect( actionVideoStop, SIGNAL( triggered() ), this, SLOT( stop() ) );
 
+  mapperSeekVideo = new QSignalMapper( this );
+  connect( mapperSeekVideo, SIGNAL( mapped(int) ), this, SLOT( seekEvent(int) ) );
+
   actionVideoBackward = new QAction( "VideoBackward", this );
   actionVideoBackward->setIcon( QIcon( style()->standardIcon( QStyle::SP_MediaSeekBackward ) ) );
+  connect( actionVideoBackward, SIGNAL( triggered() ), mapperSeekVideo, SLOT( map() ) );
+  mapperSeekVideo->setMapping( actionVideoBackward, 0 );
   actionVideoForward = new QAction( "VideoForward", this );
   actionVideoForward->setIcon( QIcon( style()->standardIcon( QStyle::SP_MediaSeekForward ) ) );
+  connect( actionVideoForward, SIGNAL( triggered() ), mapperSeekVideo, SLOT( map() ) );
+  mapperSeekVideo->setMapping( actionVideoForward, 1 );
 
   actionVideoLoop = new QAction( "Repeat", this );
   actionVideoLoop->setCheckable( true );
diff --git a/source/app/plaYUVerApp.h b/source/app/plaYUVerApp.h
index 0cc6bf7..b80f739 100644
--- a/source/app/plaYUVerApp.h
+++ b/source/app/plaYUVerApp.h
@@ -65,6 +65,7 @@ private Q_SLOTS:
   void stop();
   void playEvent();
   void seekSliderEvent( int new_frame_num );
+  void seekEvent( int direction );
 
   void selectModule( QAction * );
 
@@ -118,6 +119,7 @@ private:
   QSlider *m_pcFrameSlider;
 
   QSignalMapper *mapperZoom;
+  QSignalMapper *mapperSeekVideo;
   QSignalMapper *mapperWindow;
 
   /**