The first you need to do is load the DVD file. Click "Load DVD" button you will see two Choice.
Import From DVD Disk: Select the location of the source drive. AoA DVD Ripper also allows you to load DVD folders from the hard drive that contain IFO and VOB files.
Open an IFO File: You can select an IFO file in the VIDEO_TS folder under the DVD folder. The .IFO files contain menus and other information about the video and audio.

Now, you should select the video format you want to convert(1).and press the "Movie Clip"(2) to the next window.

In this window you can restrict the clip range by sliding the right and the left arrows.

Press the "Chapters" button(3) you can Choose the chapters that you want to copy from the list.
AoA DVD Ripper allows you to save the selected chapters into either one large file or separate files.
For example, if you select four chapters to copy and choose "Save selected chapters into one file", then you'll get one big file which includes all four chapters. If you choose "Save selected chapters into separate files" you'll get four separate files, each containing one of the chapters.

Before converting, you should select the output directory(1) and press the "start" button(2).

OK, converting is satrt. With this software you can easily extract original movie sound track from DVD.