Section 2 : Processing the ripped files and extracting the audio
+ Start Gordian Knot
+ Choose Ripping tab, then choose Prepare the VOBs, like this

+ DGIndex will start, Go to File / Open / Browse to your project directory / choose all of files , like

+ Click Open
+ On this new window, you choose the first VOB file, like :

+ Then click OK
+ New window appear, hit F5, you 'll see :

+ Go to the Video menu and choose
- YUV / RGB / PC Scale
- iDCT Algorithm - IEEE-1180 Reference
+ Finally, go to the File menu / Save Project