Hello, it seems that you are an expert in vob conversion. I have a question and i am not know whether you can handle it. . Recenly, i am using this software ( http://www.videoconverterfactory.com/tips/vob-to-mp4.html) to convert my DVD which I bought from Amazon to iPhone. The output image is okay but the sound is out of sync. Somebody told me it was casued by the software itself. However, I have used it several times before and they all worked well.