diff --git a/app/VideoSubWindow.cpp b/app/VideoSubWindow.cpp
index 25229b9..bdf6eee 100644
--- a/app/VideoSubWindow.cpp
+++ b/app/VideoSubWindow.cpp
@@ -507,15 +507,12 @@ Bool VideoSubWindow::guessFormat( QString filename, UInt& rWidth, UInt& rHeight,
     // Guess resolution by file size
     if( rWidth == 0 && rHeight == 0 )
     {
-      Char *filename_char = new char[filename.length() + 1];
-      memcpy( filename_char, filename.toUtf8().constData(), filename.length() + 1 * sizeof(char) );
-      FILE* pF = fopen( filename_char, "rb" );
+      FILE* pF = fopen( filename.toStdString().c_str(), "rb" );
       if( pF )
       {
         fseek( pF, 0, SEEK_END );
         UInt64 uiFileSize = ftell( pF );
         fclose( pF );
-        delete[] filename_char;
 
         Int count = 0, module, frame_bytes, match;
         for( UInt i = 0; i < stdResList.size(); i++ )
diff --git a/lib/PlaYUVerStream.cpp b/lib/PlaYUVerStream.cpp
index c9d6569..7b71812 100644
--- a/lib/PlaYUVerStream.cpp
+++ b/lib/PlaYUVerStream.cpp
@@ -164,8 +164,8 @@ String PlaYUVerStream::getCodecName()
 
 Bool PlaYUVerStream::open( String filename, String resolution, String input_format_name, UInt bitsPel, Int endianness, UInt frame_rate, Bool bInput )
 {
-  UInt width;
-  UInt height;
+  UInt width = 0;
+  UInt height = 0;
   Int input_format = -1;
 
   if( resolution.size() > 0 )
@@ -575,7 +575,7 @@ Bool PlaYUVerStream::seekInputRelative( Bool bIsFoward )
 
 Bool PlaYUVerStream::seekInput( UInt64 new_frame_num )
 {
-  if( !m_bInit || new_frame_num < 0 || new_frame_num >= m_uiTotalFrameNum || ( Int64 )new_frame_num == m_iCurrFrameNum )
+  if( !m_bInit  || new_frame_num >= m_uiTotalFrameNum || ( Int64 )new_frame_num == m_iCurrFrameNum )
     return false;
 
   m_iCurrFrameNum = new_frame_num - 1;