public void Init()
        {
            if (_graph != null)
            {
                ReleaseGraph();
                Marshal.ReleaseComObject(_graph);

                _graph = null;
                GC.Collect();
            }

            _graph = new FilterGraph() as IFilterGraph;
            if (_graph != null) _graph.AddFilter(CreateRenderer() as IBaseFilter, "Video Mixing Renderer 9");

            State = MediaState.Close;
        }

        public void Open(string filename)
        {
            var mediaControl = _graph as IMediaControl;
            if (mediaControl != null)
            {
                mediaControl.RenderFile(filename);

                State = MediaState.Open;
            }
        }

        private void ReleaseGraph()
        {
            IEnumFilters filters = null;
            _graph.EnumFilters(out filters);
            IBaseFilter[] filter = new IBaseFilter[1];
            while (filters.Next(1, filter, IntPtr.Zero) == 0)
            {
                _graph.RemoveFilter(filter[0]);
            }
        }