fix opening files

app/VideoSubWindow.cpp

@@ -126,19 +126,10 @@ Void VideoSubWindow::reloadFile()
 Bool VideoSubWindow::loadFile( QString cFilename, Bool bForceDialog )
 {
   UInt Width = 0, Height = 0, FrameRate = 30;
-  Int InputFormat = -1;
+  Int InputFormat = PlaYUVerFrame::YUV420p;
 
-  if( !m_pCurrStream )
-  {
-    m_pCurrStream = new PlaYUVerStream;
-  }
-  else
-  {
-    delete m_pCurrStream;
-    m_pCurrStream = new PlaYUVerStream;
-  }
-
-  m_pCurrStream->getFormat( Width, Height, InputFormat, FrameRate );
+  if( m_pCurrStream )
+    m_pCurrStream->getFormat( Width, Height, InputFormat, FrameRate );
 
   if( m_pCurrStream->guessFormat( cFilename, Width, Height, InputFormat, FrameRate ) || bForceDialog )
   {
@@ -151,6 +142,16 @@ Bool VideoSubWindow::loadFile( QString cFilename, Bool bForceDialog )
   QApplication::setOverrideCursor( Qt::WaitCursor );
   QApplication::restoreOverrideCursor();
 
+  if( !m_pCurrStream )
+  {
+    m_pCurrStream = new PlaYUVerStream;
+  }
+  else
+  {
+    delete m_pCurrStream;
+    m_pCurrStream = new PlaYUVerStream;
+  }
+
   m_pCurrStream->open( cFilename, Width, Height, InputFormat, FrameRate );
 
   m_sStreamInfo.m_cFilename = cFilename;

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()