VLC Menu Playback>Title Output Questions

[GaryG45]

Hi,
I'm new to VLC and couldn't find what I was looking for in the documentation. I've created DVDs and ISO files using VideoStudio X5 Pro. When I use VLC to play the ISO file of a video composed of two clips and go to menu option Playback>Title, the dropdown shows the following:
DVD Menu
Title 1 [8:01]
Title 2 [25:44]

When I created the ISO with VideoStudio, I put titles on the clips in the DVD menu. Where does the Title 1 and Title 2 come from in the dropdown? When I play the DVD on my Sony Blu-ray model BDP-S780 and hit stop while playing a clip, the Sony menu shows a disc with two boxes to the right. To the right of the top box is Title 1 and to the right of the bottom box is Title 2. It appears that VLC and my Blu-ray player get the information from the same place. Are there field names for the location and is it editable? Thanks in advance for your help.

Gary

[GaryG45]

I've researched the folders and files on DVDs, and I think I've found an answer to my questions. There is a VIDEO_TS.IFO file in the VIDEO_TS folder. The IFO file contains many data structures related to the DVD, and one structure is the VMG_PTT_SRPT, Video Manager Title Play Map Table. This structure contains the number of titles on the DVD followed by 12 bytes of data for each title. I couldn't find a data structure related to the titles that could contain the name of the movie on the DVD. Therefore I believe VLC is reading this data structure and reporting back the number of titles.