class Program
    {



      [StructLayout(LayoutKind.Sequential)]
      struct RECT
      {
        public int left;
        public int top;
        public int right;
        public int bottom;
      }

      [StructLayout(LayoutKind.Sequential)]
      struct VideoHeaderInfo
      {
        public RECT rcSource;
        public RECT rcTarget;
        public UInt32 dwbitrate;
        public UInt32 dwbiterrorrate;
        public long AvgTimePerFrame;
        public BITMAPINFOHEADER bmiHeader;
      }


        [StructLayout(LayoutKind.Sequential, Pack = 1)]
        public struct BITMAPINFOHEADER
        {
            public UInt32 biSize;
            public Int32 biWidth;
            public Int32 biHeight;
            public Int16 biPlanes;
            public Int16 biBitCount;
            public UInt32 biCompression;
            public UInt32 biSizeImage;
            public Int32 biXPelsPerMeter;
            public Int32 biYPelsPerMeter;
            public UInt32 biClrUsed;
            public UInt32 biClrImportant;
        }


        static void SaveMovieThumbnail(string filename, string thumbnail_filename)
        {
            IMediaDet mediaInt = new MediaDetClass();
            mediaInt.Filename = filename;

            bool videoStreamFound = false;
            _AMMediaType oMediaType = mediaInt.StreamMediaType;

            System.Guid videoHeader = new
                              System.Guid("05589f80-c356-11ce-bf01-00aa0055595a");

            int streamCount = mediaInt.OutputStreams;
            for (int counter = 0; counter < mediaInt.OutputStreams; counter++)
            {
                mediaInt.CurrentStream = counter;
                oMediaType = mediaInt.StreamMediaType;
                if (oMediaType.formattype == videoHeader)
                {
                    videoStreamFound = true;
                    break;
                }
            }

            unsafe
            {

                if (videoStreamFound)
                {
                    VideoHeaderInfo* header =
                             (VideoHeaderInfo*)(oMediaType.pbFormat.ToPointer());

                    double length = mediaInt.StreamLength;


                    for (int i = 1; i < 30; i++)
                    {
                        string bitmap_path = "temp" + i.ToString() + ".bmp";
                        mediaInt.WriteBitmapBits(
                                      length * (i / 30.0),
                                      header->bmiHeader.biWidth,
                                      header->bmiHeader.biHeight,
                                      bitmap_path);

                        using (FileStream fs = new FileStream(bitmap_path, FileMode.Open))
                        {
                            BitmapDecoder decoder = BitmapDecoder.Create(fs, BitmapCreateOptions.None, BitmapCacheOption.None);
                            JpegBitmapEncoder encoder = new JpegBitmapEncoder();
                            encoder.Frames.Add(decoder.Frames[0]);
                            using (FileStream jpeg_fs = new FileStream("temp" + i.ToString() + ".jpg", FileMode.Create))
                            {
                                encoder.Save(jpeg_fs);
                            }
                        }
                        File.Delete(bitmap_path);

                    }


                    Marshal.FreeCoTaskMem((System.IntPtr)header);
                }
            }
            Marshal.FinalReleaseComObject(mediaInt);
        }

        static void SaveMovieThumbnail2(string filename, string thumbnail_filename)
        {

        }

        static void Main(string[] args)
        {

            string movie_path = @"Y:\Videos\Movies\Postal.LIMITED.DVDRip.XViD-PUKKA\p-p.avi";
            string out_path = "temp.jpg";

            SaveMovieThumbnail(movie_path, out_path);



        }