How to view audio waves from a video clip on a mac?

I'm trying to view the digital audiowaves from a video clip on my mac. I'm completely computer illiterate so the easier the better. I have tried uploading to iMovie but it tells me "None of the selected files or folders can be imported. Change the selection and try again". The video is a home video DVD. It was professionally made but is not like the DVD's bought at the store.

I do not need to visualize high quality sound waves, just enough that I can use them as the basis in a design project. If there's an app for iPhone where I could jsut play the DVD and record it with my phone and see the waves there, that would work. I have already looked at free recording apps and haven't found any. I'm happy to pay for an app that does this, I just don't want to pay for an app if I don't know if it will do what I need. Again, I just want to see general shape, and do not need perfection.

"… Is not like the DVDs bought at the store."

Hmm… Can you explain how it is different? There are at least six ways to make a DVD that is "not like store", so come forth with the details of this DVD, such as what are the file names on it? If I know the names of several of the files on it, I have what I need to explain the way to get stuff off this disc.

If you only need to see a sonogram of a sound file (MP3, AIF, WAVE), use Raven Lite from Cornell you Ornithology Dept.
http://www.birds.cornell.edu/brp/raven/RavenVersions.html#RavenLite

To extract audio from a video file (MP4, MOV), use iMovie.

To extract a standard MP4 file from a standard movie DVD, use Handbrake.

When I put it into iMovie, there are two folders. The first is called AUDIO_TS and that folder apears to be empty. The second is VIDEO_TS and it has the following files: VIDEO_TS.BUP, VIDEO_TS, IFO
VIDEO_TS.VOB, VTS_01_0.BUP, VTS_01)0.IFO, VTS_01_1.VOB, VTS_01_2.VOB all the way to VTS_01_5.VOB.

Is that helpful? All that I mean is that it was not a mass produced DVD. I do not know exactly what kind of DVD and a picture was printed on top of the DVD by the person who made it so I can't see what kind it is by looking at a label. Thank you for trying to help. I remember playing CD's on the computer growing up and the audiowaves would always play. It was so easy then!