diff --git a/source/ImageInterface.cpp b/source/ImageInterface.cpp
index ce86ae4..a8e0e18 100644
--- a/source/ImageInterface.cpp
+++ b/source/ImageInterface.cpp
@@ -61,9 +61,12 @@ bool ImageInterface::loadFile( const QString &fileName )
 {
   ConfigureFormatDialog formatDialog( this );
 
-  if( formatDialog.exec() == QDialog::Rejected )
+  if( m_currStream.needFormatDialog( fileName ) )
   {
-    return false;
+    if( formatDialog.exec() == QDialog::Rejected )
+    {
+      return false;
+    }
   }
 
   QApplication::setOverrideCursor( Qt::WaitCursor );
diff --git a/source/InputStream.cpp b/source/InputStream.cpp
index 2015194..07d712e 100755
--- a/source/InputStream.cpp
+++ b/source/InputStream.cpp
@@ -119,6 +119,19 @@ QStringList InputStream::supportedPixelFormatList()
   return formats;
 }
 
+Bool InputStream::needFormatDialog( QString filename )
+{
+  QString fileExtension = QFileInfo(filename).completeSuffix();
+  if( !fileExtension.compare( QString("yuv") ) )
+  {
+    return true;
+  }
+  else
+  {
+    return false;
+  }
+}
+
 Void InputStream::init( QString filename, UInt width, UInt height, Int input_format )
 {
 
diff --git a/source/InputStream.h b/source/InputStream.h
index 984236e..9687d23 100755
--- a/source/InputStream.h
+++ b/source/InputStream.h
@@ -90,6 +90,8 @@ public:
     YUVFormat = 0, // Use color space.
   };
 
+  Bool needFormatDialog( QString filename );
+
   Void init( QString filename, UInt width, UInt height, Int input_format );
 
   Void YUV420toRGB();