Convert IFO to MP3

Converting DVD-Video Disc Information Files directly to MP3 Audio Files (.ifo to .mp3 conversion) is not possible, since IFO files only contain information, but no media data. Only in conjunction with VOB and VRO files can these be used as complete video data files.

Only the entire set of files (IFO, VOB, VRO) can be converted to a single video format, such as MP4.

Once such conversion is accomplished, you can easily convert MP4 to MP3.

Simply put, it is impossible to convert IFO to MP3 directly.
Thus, there is no so-called ifo to mp3 converter or a free online ifo to mp3 converter to be found.