Following is its detailed user guide, hope it will be of some help for you folks who are looking for such a solution.
First of all,free download Blu Ray Ripper for Macand run it.
Step 1: Import the DVD or Blu-Ray DVD file into this program
Click "DVD Folder"or "IFO File"to load your Blu-Ray or DVD files.

Step 2.:Select output format and set destination folder
Click the dropdown list of "Format" to select an output format, which one to choose is depending on the type and tech specifications of your iPod.
Meanwhile, you can click the folder icon at the opposite side of "Output" to decide where to locate the output files for your iPod.
Tips:
You can also do many video editing works about your output video.
1. Merge into one file
If you would like to combine multiple video clips to be as a single file, you can achieve this goal via ticking the checkbox "Merge into one file".
2. Effect
You can adjust the "Brightness", "Contrast", "Saturation" of your output video and also you can select to use the "deinterlacing" function which make your video more enjoyable.

3. Trim
To pick up any part of your BD movie to converter, you can use "Trim" function.
4. Crop
You can choose any play area to convert by using the Crop function.
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5. Watermark
You can add your own watermark on the output video, and the watermark can be words and also picture. You can choose the font of your words and other really enjoyable function.
Step 3: Click the “Convert” button to start the conversion
Well, that’s all. Blu Ray Ripper for Macmust open your eyes after my demonstation