diff --git a/app/main.cpp b/app/main.cpp
index 887aa5b..07ecb34 100644
--- a/app/main.cpp
+++ b/app/main.cpp
@@ -1,6 +1,6 @@
 /*    This file is a part of plaYUVer project
- *    Copyright (C) 2014  by Luis Lucas      (luisfrlucas@gmail.com)
- *                           Joao Carreira   (jfmcarreira@gmail.com)
+ *    Copyright (C) 2014-2015  by Luis Lucas      (luisfrlucas@gmail.com)
+ *                                Joao Carreira   (jfmcarreira@gmail.com)
  *
  *    This program is free software; you can redistribute it and/or modify
  *    it under the terms of the GNU General Public License as published by
diff --git a/lib/PlaYUVerStream.cpp b/lib/PlaYUVerStream.cpp
index d1713e7..ee743ff 100644
--- a/lib/PlaYUVerStream.cpp
+++ b/lib/PlaYUVerStream.cpp
@@ -295,12 +295,13 @@ Void PlaYUVerStream::getFormat( UInt& rWidth, UInt& rHeight, Int& rInputFormat,
 
 Bool PlaYUVerStream::guessFormat( QString filename, UInt& rWidth, UInt& rHeight, Int& rInputFormat, UInt& rFrameRate )
 {
-  Bool bRet = false;
+  Bool bGuessed = true;
+  Bool bGuessedByFilesize = false;
   QString FilenameShort = QFileInfo( filename ).fileName();
   QString fileExtension = QFileInfo( filename ).suffix();
   if( !fileExtension.compare( "yuv" ) )
   {
-    bRet = true;
+    bGuessed = false;
     // Guess pixel format
     QStringList formats_list = PlaYUVerFrame::supportedPixelFormatListNames();
     for( Int i = 0; i < formats_list.size(); i++ )
@@ -388,14 +389,15 @@ Bool PlaYUVerStream::guessFormat( QString filename, UInt& rWidth, UInt& rHeight,
         {
           rWidth = sizeResolution.at( match ).width();
           rHeight = sizeResolution.at( match ).height();
+          bGuessedByFilesize = true;
         }
       }
     }
 
     if( rWidth > 0 && rHeight > 0 && rInputFormat >= 0 )
-      bRet = false;
+      bGuessed = true && !bGuessedByFilesize;
   }
-  return bRet;
+  return !bGuessed;
 }
 
 Void PlaYUVerStream::loadAll()