public trak(int Width, int Height, int TrackId) : base("trak") { header = new tkhd(Width, Height, TrackId); AddChild(header); body = new mdia(); AddChild(body); handler_ref = new hdlr(Width, Height); body.AddChild(handler_ref); media_info = new minf(Width, Height, TrackId); body.AddChild(media_info); }