DexterLib / Video Frame Exporting...

Question

Hello there, guys from all over the world... I need your help a little. It's about DexterLib and MediaDet Class. Every tutorial, or article on the internet suggested that this should be the solution  for me to export a frame from a movie into a Bitmap object. But I can't. The code I copied the code character by character and still does not work. Do you have any ideas? What u have below is the exporting to byte array with GetBitmapBits() function

using System;
using System.Collections.Generic;
using System.Text;
using DexterLib;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;

namespace mediad
{
    class Program
    {
        public static Guid MEDIATYPE_Video = new Guid(0x73646976, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
        static void Main(string[] args)
        {
            System.Console.WriteLine("** MediaD test app //");
            MediaDetClass md = new MediaDetClass();
            _AMMediaType mt;
            bool found = false;

            md.Filename = "e:\\torrents\\Evanescence - Bring Me To Life.avi";
           
            int streamsNumber = md.OutputStreams;

            for (int i = 0; i < streamsNumber; i++)
            {
                md.CurrentStream = i;
                mt = md.StreamMediaType;
                if (mt.majortype == MEDIATYPE_Video) found = true;
            }

            if (!found) Console.WriteLine("File \""+md.Filename+"\" does not have video stream.");
            else
            {
                Console.WriteLine("Video stream found. Moving forward...");
                unsafe
                {
                    int size = 0;
                    byte* buff = null;

                    try
                    {
                        md.GetBitmapBits(5.3, ref size, ref *buff, 640, 480);
                        Console.WriteLine("Buffer size found: " + size.ToString());
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine(e.ToString());
                    }

                    try
                    {
                        buff = (byte*)Marshal.AllocHGlobal(size);
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine(e.ToString());
                    }

                    try
                    {
                        md.GetBitmapBits(md.StreamLength * 0.3, ref size, ref *buff, 640, 480);
                        Console.WriteLine("Frame loaded");
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine(e.ToString());
                    }

                }
            }

        }
    }
}