DVD Bit Rate Viewer is, as the name suggests, a Bitrate viewer for DVDs. It works very simply, as all you have to do is select the DVD source, and view the information required on-screen. You can see the total DVD bitrate on one side, and the separate bitrates for audio and video on the other.
DVD Bit Rate Viewer is a completely free application, and takes up just 8kb on your hard drive; a really insignificant size. It requires no installation; just download it and run it.