Thank you for your information. I have also tried Sorenson Squeeze, but as I mentioned in my previous thread, I have few audio issues. All of my DVDs have few seconds of silence at the beginning and hence entire output has no audio.
I am surprised to see that all small conversion programs (DVD to MP4) works great without audio issues. But, all these top encoders (Digital Rapids, Rhozet, Squeeze...) are producing no audio.
We have to encode more than 200 DVDs and hence looking for some good software, so that we can install it on couple Amazon EC2 instances for quick encoding.