User Operation Flags (Uops)

User operation flags appear at three different levels, there is one for the title in VMG_TT_SRPT (only Uop0 and Uop1, as bits 0 and 1 of Title Type), one for each Program Chain, and one in each VOBU.

These flags are OR'ed together, a set bit in any mask inhibits the associated control.

Number	Controls affected	PGC	VOBU
0	Time play or search
1	PTT play or search
2	Title play
3	Stop
4	GoUp
5	Time or PTT search
6	TopPG or PrevPG search
7	NextPG search
8	Forward scan
9	Backward scan
10	Menu call - Title
11	Menu call - Root
12	Menu call - Subpicture
13	Menu call - Audio
14	Menu call - Angle
15	Menu call - PTT
16	Resume
17	Button select or activate
18	Still off
19	Pause on
20	Audio stream change
21	Subpicture stream change
22	Angle change
23	Karaoke audio mix change
24	Video presentation mode change

Reprinted with the kind permission of MPUCoder