//size for buffer
1.) int bufferSize = (((s.Width * s.Height) * 24) / 8) + bmpinfoheaderSize;
 
//allocates enough memory
2.) IntPtr frameBuffer = System.Runtime.InteropServices.Marshal.AllocHGlobal( _
  bufferSize);
3.) byte* frameBuffer2 = (byte*)frameBuffer.ToPointer();
 
4.) mediaDet.GetBitmapBits(streamLength * percentagePosition, ref bufferSize, _
  ref *frameBuffer2, target.Width, target.Height);
 
5.) Bitmap bmp = new Bitmap(target.Width, target.Height, target.Width * 3, _
  System.Drawing.Imaging.PixelFormat.Format24bppRgb, new IntPtr(frameBuffer2 + _
  bmpinfoheaderSize));

'get size for buffer 
1.) Dim bufferSize As Integer = (((s.Width * s.Height) * 24) / 8) + _
  bmpinfoheaderSize
 
'allocates enough memory to store the frame 
2.) Dim frameBuffer As IntPtr = _
  System.Runtime.InteropServices.Marshal.AllocHGlobal(bufferSize)
3.) Dim frameBuffer2 As Byte* = CByte(frameBuffer.ToPointer()) 
 
4.) mediaDet.GetBitmapBits(streamLength * percentagePosition, bufferSize, _
  *frameBuffer2, target.Width, target.Height)
 
5.) Dim bmp As New Bitmap(target.Width, target.Height, target.Width * 3, _
  System.Drawing.Imaging.PixelFormat.Format24bppRgb, New IntPtr(frameBuffer2 + _
  bmpinfoheaderSize))