I hate to say this but bad rips generally put the audio in front of the video between .5 and .7 seconds depending on the miss use of the tools. But you would think people would realize this along the way unless everything has been automated.
Some players don't enforce sync, like MPlayer so I guess it could be missed.
It's ctrl k audio delay up and ctrl l audio delay down. In full screen mode you will see the delay flash on screen when it's applied. Considering how far it's out don't expect perfect lipsync.