private void miOpenFile_Click(object sender, System.EventArgs e)
        {
            OpenFileDialog dlg = new OpenFileDialog();

            if (dlg.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    fileName  = dlg.FileName;
                    this.Text = Path.GetFileName(dlg.FileName);

                    //create the MediaDetClass and set its properties
                    md               = new DexterLib.MediaDet();
                    md.Filename      = fileName;
                    md.CurrentStream = 0;
                    int len = (int)md.StreamLength;

                    //fix a few Gui stuff
                    label1.Text       = "Length: " + len.ToString();
                    trackBar1.Minimum = 0;
                    trackBar1.Maximum = len;
                    trackBar1.Value   = 0;

                    //make sure we have a unique name then call WriteBitmapBits to
                    //a file then use it to fill the picture box
                    counter++;
                    string fBitmapName = storagePath + counter.ToString() + ".bmp";
                    md.WriteBitmapBits(0, 1366, 768, fBitmapName);
                    pictureBox1.Image = new Bitmap(fBitmapName);
                }
                catch (Exception) { MessageBox.Show("Coulnd't open movie file"); }
            }
        }
            void Scan()
            {
                md = new DexterLib.MediaDet();
                Image img;

                md.Filename      = fileName;
                md.CurrentStream = 0;
                int len = (int)md.StreamLength;

                for (float i = 0.0f; i < len; i = i + interval)
                {
                    counter++;
                    string fBitmapName = storagePath + Path.GetFileNameWithoutExtension(fileName)
                                         + "_" + counter.ToString();
                    md.WriteBitmapBits(i, 1366, 768, fBitmapName + ".bmp");
                    img = Image.FromFile(fBitmapName + ".bmp");
                    img.Save(fBitmapName + ".jpg", ImageFormat.Jpeg);
                    img.Dispose();
                    System.IO.File.Delete(fBitmapName + ".bmp");
                }
            }