I recently tried iSofter DVD Audio Ripper and I can say that I was impressed!
It's main features are:
- rip DVD to Mp3, convert DVD to Wav format;
- Supports ripping by chapters, custom time or custom file size;
- You can rip a clip by specifying beginning and ending time;
- Output audio quality is adjustable from 80 Kbits to 320 Kbits when ripping to Mp3;
- You can edit ID3 tag for your DVD sound with iSofter DVD Audio Ripper;
- Allows you to select a language or audio track when ripping multi-language DVDs.

Download a free full working trial here.

This is the first screen of iSofter DVD Audio Ripper. Chick DVD(1) to proceed.

After you successfully load the DVD, the DVD info is displayed in the right window. Sometimes some chapters/episodes hide in another index, you can change an index in "Index" dropdown box to load these chapters/episodes.

You can select the audio track for the target files in the "Audio" combo-box in the Input area.

You may edit ID3 tag by entering the info in the "Genre", "Album", "Artist" and "Year" boxes. MP3 format supports ID3 tag while Wave format doesn't

Select the target audio format in the "Format" combo-box in the Output area. If you choose "MP3 (*.mp3)" as the output format, iSofter DVD Audio Ripper Deluxe allows you to specify the audio quality by clicking the "Settings" button. In general, you'd better keep the default value, that's enough to reserve wonderful audio quality.

In general, DVDs are ripped by chapters. Especially to music DVDs, a chapter is a song.
If you prefer to split DVD audio tracks by certain file size, please select "Custom Size" in the "Split" box. You may enter the specifying number by clicking "Settings" button. The default is "5 MB".
If you want to rip by certain duration, please select "Custom time", you may enter the specifying number by clicking "Settings" button. the default is 6 minutes.

You may specify the output path by clicking "Browse" button or directly entering a file path in the "Folder" box at the bottom of the Output area.

With all settings being properly done, choose "Encode" or click to "Start" button to start ripping.

If you want to encode from a specific starting point, firstly, you must change "Split" to "Custom size" or "Custom Time", then choose "Encode From Current Position" in the "START" menu.
If you want to encode a segment, please choose "Encode Segment" in the "START" menu, then enter the beginning time and the duration of the clip. For example, you want a clip from 00:00:00 to 02:51:01, you should enter From 00:00:00 to 02:51:01, after that, click the "OK" button.

After the file is successfully ripped, you may click the " Folder" button to browse the output files.

Note: During ripping, please don't run other large programs to avoid ripping speed being lowered.

As you see iSofter DVD Audio Ripper is very simple, while it's fast and powerful.

Download a free full working trial here.