diff --git a/app/VideoHandle.cpp b/app/VideoHandle.cpp
index c48200a..9fef225 100644
--- a/app/VideoHandle.cpp
+++ b/app/VideoHandle.cpp
@@ -27,6 +27,9 @@
 #include "PlaYUVerSubWindowHandle.h"
 #include "VideoHandle.h"
 #include "DialogSubWindowSelector.h"
+#if( _CONTROL_PLAYING_TIME_ == 1 )
+#include <QElapsedTimer>
+#endif
 
 namespace plaYUVer
 {
diff --git a/app/VideoHandle.h b/app/VideoHandle.h
index df11798..3383168 100644
--- a/app/VideoHandle.h
+++ b/app/VideoHandle.h
@@ -36,6 +36,10 @@
 #include "WidgetFrameNumber.h"
 #include "FramePropertiesSidebar.h"
 
+#define _CONTROL_PLAYING_TIME_ 1
+
+class QElapsedTimer;
+
 namespace plaYUVer
 {
 
@@ -99,6 +103,11 @@ private:
   QTimer *m_pcPlayingTimer;
   Bool m_bIsPlaying;
 
+#if( _CONTROL_PLAYING_TIME_ == 1 )
+  UInt m_uiNumberPlayedFrames;
+  Double m_dAverageFps;
+  QElapsedTimer* m_pcPlayControlTimer;
+#endif
 
   UInt64 getMaxFrameNumber();
   Void setTimerStatus();
diff --git a/lib/PlaYUVerFramePixelFormats.h b/lib/PlaYUVerFramePixelFormats.h
index 82a2bb2..7185131 100644
--- a/lib/PlaYUVerFramePixelFormats.h
+++ b/lib/PlaYUVerFramePixelFormats.h
@@ -33,7 +33,7 @@ namespace plaYUVer
 {
 
 template<typename T>
-Void yuvToRgb( T iY, T iU, T iV, T &iR, T &iG, T &iB )
+static inline  Void yuvToRgb( T iY, T iU, T iV, T &iR, T &iG, T &iB )
 {
   iR = iY + 1402 * iV / 1000;
   iG = iY - ( 101004 * iU + 209599 * iV ) / 293500;
@@ -55,7 +55,7 @@ Void yuvToRgb( T iY, T iU, T iV, T &iR, T &iG, T &iB )
 }
 
 template<typename T>
-Void rgbToYuv( T iR, T iG, T iB, T &iY, T &iU, T &iV )
+static inline Void rgbToYuv( T iR, T iG, T iB, T &iY, T &iU, T &iV )
 {
   iY = ( 299 * iR + 587 * iG + 114 * iB + 500 ) / 1000;
   iU = ( 1000 * ( iB - iY ) + 226816 ) / 1772;