diff -r 1cbb0d5bf7f2 -r b6dbf97aba93 mmplugins/lib3gp/impl/inc/filewriter.h
--- a/mmplugins/lib3gp/impl/inc/filewriter.h	Thu Sep 16 18:39:58 2010 +0100
+++ b/mmplugins/lib3gp/impl/inc/filewriter.h	Thu Sep 16 18:57:38 2010 +0100
@@ -21,10 +21,10 @@
 #include "mp4atom.h"
 
 // CONSTANTS
-const TInt KFileWriterBufferSizeSmall = 2048;
-const TInt KFileWriterBufferSizeLarge = (2*65536);  
-const TInt KFileWriterSoftBufLimit = 10;
-const TInt KFileWriterHardBufLimit = 15;
+const TInt KFileWriterBufferSizeSmall = 65536;
+const TInt KFileWriterBufferSizeLarge = (4*65536);  
+const TInt KFileWriterSoftBufLimit = 12;
+const TInt KFileWriterHardBufLimit = 16;
 const TInt KFileWriterMinBufferCount = 4; // shouldn't be less than 4
 
 // FORWARD DECLARATIONS
@@ -50,7 +50,7 @@
         /**
         * Two-phased constructor.
         */
-        static CFileWriter* NewL( RFile64& aFile );
+        static CFileWriter* NewL( RFile64& aFile, TInt aInitSetSize = 0, TInt aOutputBufferSizeSmall = KFileWriterBufferSizeSmall, TInt aOutputBufferSizeLarge = KFileWriterBufferSizeLarge );
 
         /**
         * Destructor.
@@ -89,7 +89,12 @@
         * @since 3.0
         * @param aHandle MP4Handle.
         */
-        void SetOutputBufferCount( MP4Handle aHandle );        
+        void SetOutputBufferCount( MP4Handle aHandle ); 
+
+        inline TInt64 OutputFileSize() const
+			{
+			return iOutputFileSize;
+			}    
 
     protected: // Functions from base classes
         
@@ -108,7 +113,7 @@
         /**
         * C++ default constructor.
         */
-        CFileWriter();
+        CFileWriter( TInt aInitSetSize, TInt aOutputBufferSizeSmall, TInt aOutputBufferSizeLarge );
 
         /**
         * By default Symbian 2nd phase constructor is private.
@@ -128,6 +133,12 @@
         * @since 2.6
         */
         void AllocateBuffersL();
+		
+		/**
+		* Updates output file size and reserves extra space for following writing if iSetSize is set.
+		* Takes into account if the position in the file was changed.
+		*/
+        void UpdateOutputFileSize();
 
 private:
         // Whether we are flushing after async write.
@@ -139,16 +150,24 @@
         // Flag whether init has been done
         TBool iMemReadyForWriting;
 
-		// Write error code.
-	    TInt iError;
+        // Write error code.
+        TInt iError;
+        
+        // Current set file size
+        TInt64 iSetSize;
+        // Current output file size
+	    TInt64 iOutputFileSize;		
+
+        TInt iOutputBufferSizeSmall;
+        TInt iOutputBufferSizeLarge;
+        
         // Output buffer size.
         TInt iOutputBufferSize;
         // Hard limit for max output buffers
         TInt iMaxOutputBufHardLimit;
         // Soft limit for max output buffers
         TInt iMaxOutputBufSoftLimit;
-        // Current output file size
-		TInt64 iOutputFileSize;
+
 
         // Output file for writes.
         RFile64* iOutputFile;