The way I'd do it on the mac ... there's a few programs that can do the job. 1st step would be to extract the dvd contents to HDD. Then I'd use another program to separate (demux) the files -> separate the audio & video files. In which case you'll probably end up with several ac3 files. Or my utilities also have the option of extracting the audio & converting to AIFF. From there I can then use an audio editor to convert from 48 to 44.1 kHz. Then do as I wish such as convert to mp3 or whatever.