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diff --git a/libutil/TrackModifier.h b/libutil/TrackModifier.h
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+///////////////////////////////////////////////////////////////////////////////
+//
+//  The contents of this file are subject to the Mozilla Public License
+//  Version 1.1 (the "License"); you may not use this file except in
+//  compliance with the License. You may obtain a copy of the License at
+//  http://www.mozilla.org/MPL/
+//
+//  Software distributed under the License is distributed on an "AS IS"
+//  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
+//  License for the specific language governing rights and limitations
+//  under the License.
+// 
+//  The Original Code is MP4v2.
+// 
+//  The Initial Developer of the Original Code is Kona Blend.
+//  Portions created by Kona Blend are Copyright (C) 2008.
+//  All Rights Reserved.
+//
+//  Contributors:
+//      Kona Blend, kona8lend@@gmail.com
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef MP4V2_UTIL_TRACKMODIFIER_H
+#define MP4V2_UTIL_TRACKMODIFIER_H
+
+namespace mp4v2 { namespace util {
+
+///////////////////////////////////////////////////////////////////////////////
+
+class MP4V2_EXPORT TrackModifier
+{
+private:
+    class Properties
+    {
+    private:
+        TrackModifier& _trackModifier;
+
+    public:
+        Properties( TrackModifier& );
+
+        void update();
+
+        MP4Integer24Property&    flags;
+        MP4Integer16Property&    layer;
+        MP4Integer16Property&    alternateGroup;
+        MP4Float32Property&      volume;
+        MP4Float32Property&      width;
+        MP4Float32Property&      height;
+        MP4LanguageCodeProperty& language;
+        MP4StringProperty&       handlerType;
+        MP4StringProperty&       handlerName;
+        MP4BytesProperty*        userDataName;
+
+    private:
+        MP4Property& refProperty( const char* );
+        MP4Property* findProperty( const char* );
+        void updateProperty( const char*, MP4Property** );
+    };
+
+    friend class Properties;
+
+private:
+    static MP4Atom& refTrackAtom( MP4File&, uint16_t );
+
+private:
+    MP4Atom&   _track;
+    Properties _props;
+
+    // Track Header
+    bool     _enabled;
+    bool     _inMovie;
+    bool     _inPreview;
+    uint16_t _layer;
+    uint16_t _alternateGroup;
+    float    _volume;
+    float    _width;
+    float    _height;
+
+    // Media Header
+    bmff::LanguageCode _language;
+
+    // Handler Reference
+    string _handlerType;
+    string _handlerName;
+
+    // User Data name
+    string _userDataName;
+
+public:
+    MP4File&         file;
+    const uint16_t   trackIndex;
+    const MP4TrackId trackId;
+
+    const bool&     enabled;
+    const bool&     inMovie;
+    const bool&     inPreview;
+    const uint16_t& layer;
+    const uint16_t& alternateGroup;
+    const float&    volume;
+    const float&    width;
+    const float&    height;
+
+    const bmff::LanguageCode& language;
+
+    const string& handlerType;
+    const string& handlerName;
+
+    const string& userDataName;
+
+public:
+    TrackModifier( MP4FileHandle, uint16_t );
+    ~TrackModifier();
+
+    void setEnabled        ( bool );
+    void setInMovie        ( bool );
+    void setInPreview      ( bool );
+    void setLayer          ( uint16_t );
+    void setAlternateGroup ( uint16_t );
+    void setVolume         ( float );
+    void setWidth          ( float );
+    void setHeight         ( float );
+    void setLanguage       ( bmff::LanguageCode );
+    void setHandlerName    ( const string& );
+    void setUserDataName   ( const string& );
+
+    // set by string
+    void setEnabled        ( const string& );
+    void setInMovie        ( const string& );
+    void setInPreview      ( const string& );
+    void setLayer          ( const string& );
+    void setAlternateGroup ( const string& );
+    void setVolume         ( const string& );
+    void setWidth          ( const string& );
+    void setHeight         ( const string& );
+    void setLanguage       ( const string& );
+
+    bool hasUserDataName() const;
+    void removeUserDataName();
+
+    void dump( ostream&, const string& );
+
+private:
+    void fetch();
+
+    static string toString( bool );
+    static string toString( float, uint8_t, uint8_t );
+
+    static bool&     fromString( const string&, bool& );
+    static float&    fromString( const string&, float& );
+    static uint16_t& fromString( const string&, uint16_t& );
+
+    static string toStringTrackType( const string& );
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+}} // namespace mp4v2::util
+
+#endif // MP4V2_UTIL_TRACKMODIFIER_H