This is quite well known. Just let it keep going. Can take AGES sometimes. It will even show up in the force quit window as not responding. But it is still working. Be patient. If you keep watching the force quit window idvd will randomly appear as normal and then back to not responding. Strange and annoying but stick with it.
BE PATIENT lol just let it go... it can take a while... a long while.. it looks like nothing is happening but there is somethin happening... i get agravated 2... i find walking away and coming back wayyy later helps lol