diff --git a/source/lib/PlaYUVerFrame.cpp b/source/lib/PlaYUVerFrame.cpp
index 91aefb3..0a0e4b4 100755
--- a/source/lib/PlaYUVerFrame.cpp
+++ b/source/lib/PlaYUVerFrame.cpp
@@ -182,9 +182,9 @@ static inline Void yuvToRgb( Int iY, Int iU, Int iV, Int &iR, Int &iG, Int &iB )
 template<typename T>
 Void rgbToyuv( T iR, T iG, T iB, T &iY, T &iU, T &iV )
 {
-  iY = 0;
-  iU = 0;
-  iV = 0;
+  iY = ( 299*iR + 587*iG + 114*iB + 500 )/1000;
+  iU = ( 1000*( iB - iY ) + 226816 )/1772;
+  iV = ( 1000*( iR - iY ) + 179456 )/1402;
 }
 
 Void PlaYUVerFrame::FrametoRGB8()
@@ -401,6 +401,32 @@ UInt64 PlaYUVerFrame::getBytesPerFrame()
   return 0;
 }
 
+UInt PlaYUVerFrame::getChromaLength() const
+{
+  switch( m_iPixelFormat )
+  {
+  case YUV420p:
+    return m_uiWidth * m_uiHeight / 4;
+    break;
+  case YUV444p:
+    return m_uiWidth * m_uiHeight;
+    break;
+  case YUV422p:
+  case YUYV422:
+    return m_uiWidth * m_uiHeight / 2;
+    break;
+  case GRAY:
+    return 0;
+    break;
+  case RGB8:
+    return m_uiWidth * m_uiHeight;
+    break;
+  default:
+    return 0;
+  }
+  return 0;
+}
+
 Pixel PlaYUVerFrame::ConvertPixel( Pixel sInputPixel, Int eOutputSpace )
 {
   Pixel sOutputPixel =
diff --git a/source/lib/PlaYUVerFrame.h b/source/lib/PlaYUVerFrame.h
index 2c49fdf..eee11cc 100755
--- a/source/lib/PlaYUVerFrame.h
+++ b/source/lib/PlaYUVerFrame.h
@@ -118,8 +118,9 @@ public:
   Void CopyFrom( PlaYUVerFrame* );
 
   UInt64 getBytesPerFrame();
+  UInt getChromaLength() const;
 
-  Pel*** getPelBufferYUV()
+  Pel*** getPelBufferYUV() const
   {
     return m_pppcInputPel;
   }