You can demux (demultiplex) the audio from the VOBs in your VIDEO_TS rip folder,
OR, you can simply extract the audio
during ripping, with DVD Decrypter. As I'm sure you realise, there are quite a number of ways this particular task can be accomplished.
But since you are already using DVD Decrypter, I will describe how that particular piece of software can be used to get what you want.
Load-up DVD Decrypter again, and insert the DVD.
You will then see a list of the contents of the disc, from which you can cherry-pick the relevant files for audio purposes.
Holding-down the CTRL button, select the significantly-sized VOB files (i.e.
don't select any that are just a few hundred kilobytes). In the following picture, you can see that the significantly-sized VOBs on my inserted disc happen to be:
VTS_02_1.VOB [1,048,404 kb]
VTS_02_2.VOB [1,048,404 kb]
VTS_02_3.VOB [ 84,288 kb]
VTS_03_1.VOB [1,048,404 kb]
VTS_03_2.VOB [ 427,848 kb]
VTS_04_1.VOB [ 649,478 kb]
Now, because VTS_04_1.VOB is a solo, medium-sized VOB, in it's own titleset directory (VTS means Video Title Set), and towards the end of the disc, it is probably an 'extras' directory, like interviews, or whatever, but if you're unsure, just go ahead and include such VOBs, as it doesn't cost you a dime to try the ripped material and delete anything you don't want. You will generally never need to choose ANY of the VOBs that have a designation of 'zero' at the end - e.g.: VTS_01_
0.VOB or VTS_02_
0.VOB (
even if they are significantly-large). This is because VOBs with a designation of 'zero',
at the end, relate to content placed within the DVD
menus, not the main movie content (the DVD authoring system structures the data such that the menu sections of the multiplexed VOB are situated at the beginning of the first VOB, in each titleset, hence the 'zero' designation).
Anyway, in DVD Decryptor, after you have highlighted the significant VOBs, there is a 'hidden' drop-down menu option, accessible by RIGHT-clicking the mouse on any area of the highlighted block of selections you've just chosen:
From that drop-down menu, select
'Stream Processing...'
I realise this seems a little counter-intuitive, given that you
do actually want to demux the audio content from the VOB files, but, within the following dialogue, in DVD Decrypter, please
don't choose 'Demux'.
Just de-select the video checkbox, leaving only the primary audiostream selected (in the case of my illustration, the disc happens to have .AC3 audio format, but yours may say PCM or DTS, or, if an old PAL disc, might even say .MP2 or .M2A)
Then select the 'Raw' option:
and hit the 'OK' button, whereupon it'll take a few minutes to rip the files:
(note in the above screengrab, that DVD Decrypter is telling me precisely what format and bitrate the audio files are, on the disc)
Here is the result of the above rip:
Don't worry about the 'DELAY' messages in the filenames - that only relates to the alignment of the audio with the original video stream, and is of zero concern for our purposes.
Now all you need to do, if you're not playing back the files on your computer, is to drop the above files into an audio editor of your choice (Adobe Audition, CoolEdit, Audacity, Reaper, Goldwave, Steinberg Wavelab, etc.) and slice-and-dice the files into individual songs, and export them in your choice of codec. If you don't have an audio editor, yet, and you need a 'free' one, then Reaper is a decent quality option, with a nag screen, but full functionality: www.reaper.fm
PS: If your audio editor doesn't import .ac3 files, you can use freeware 'MPEG StreamClip' to transcode them (non-deleteriously) to 16bit 48khz .AIFF files. MPEG Streamclip will happily read VOBs or demuxed .AC3 files; whichever you prefer. It's a great little piece of software.
I know this tutorial does not describe the fastest way to perform this task - there are so many ways to do it (post-rip use of MPEG StreamClip, for example - see next post, below), some methods with dedicated audio-ripping functionality, such as DVDAE.com are definitely faster.
I have described the above method only because you already have DVD Decrypter, and it is reliable, without costing you a dime.
If you'd prefer to use different freeware options, and need assistance, I'll be happy to oblige.
.