dvdrip too many video packets in the buffer
 

Sorry for my bad english and my small linux-knowledge.
I try to rip a DVD, I followed the instructions and ripper is starting the extracting of a chapter , but when it seemes nearly finished, it stops, saying and the terminal says (encoding would be the next step but cannot start it as long as extraction isn't finished).
Could someone explain in simple english what I have to do ?
I have Ubuntu 8.04 - Hardy Heron
Thank you

I hate to ask people to try other software but you might want to give handbrake a try. I use it on my laptop running linux mint and it works great. you can get it from here