Adding a downmixed audio track to a DVD ISO

I would like to add an audio track to a movie DVD ISO.
My problem is that to play iso versions of my video DVDs using a WD TV Live Media player. Unfortunately many of the DVDs only have an ACR3 5.1 for the main movie audio and WD do a bad job of down mixing to stereo which is what I need.

Handbrake seems to be able to do exactly what I want but for mp4 and mkv.

Is there any software to add a stereo down mixed track and get a playable ISO with the 2 audio tracks?

Add: I'd stress they are my paid for DVDs which haven't had a stereo track included.

mjf said:

I would like to add an audio track to a movie DVD ISO.
My problem is that to play iso versions of my video DVDs using a WD TV Live Media player. Unfortunately many of the DVDs only have an ACR3 5.1 for the main movie audio and WD do a bad job of down mixing to stereo which is what I need.

Handbrake seems to be able to do exactly what I want but for mp4 and mkv.

Is there any software to add a stereo down mixed track and get a playable ISO with the 2 audio tracks?

Add: I'd stress they are my paid for DVDs which haven't had a stereo track included.

Is this just a very difficult thing to do?

Try Freemake Video Converter.

It may not take the ISO, but you can mount it on a virtual drive and it should take it. Convert DVD to DVD :). Choose destination as ISO. You must get a DVD ISO with Stereo sound if what the screenshot tells is true. Hmmmm.... You may not have much control on various parameters (except the ones in blue). It is all simple click, click,click. ( I only explored the possibility and did not run the trial )



There may be other Video Converters which may do the same with better control on various parameters. You may have to check and try. Try XMedia Recode.