Video Title Set. In DVD-Video, a collection of Titles and Video Title Set Menu (VTSM) to control 1 to 99 Titles. It is composed of the Video Title Set Information (VTSI), the Video Object Set for the Menu (VTSM_VOBS), the Video Object Set for the Title (VTST_VOBS), and a backup of the VTSI (VTSI_BUP).
(Video Title Set) Usually holds a DVD's program material, and can be comprised of multiple PGC's. DVD's can have multiple VTS's, much like the tracks of an audio CD. The VTS domain is below or under that of the VMG in regards to the DVD logical structure.