Apple DVD Studio Pro 4 - Manual (Page 502)

To obtain the value of the stream that is selected and displayed, add 64 to the value of
the stream. For example: Stream 1 has a value of 0. If you add that value to the value of
the display flag “on” (64), you get a total of 64. Stream 2 has a value of 1; if you add the
value of the display flag on (64) to it, you get a total of 65.
The following table lists the possible settings for SPRM 2:
SPRM 2 value with the stream
selected and display on SPRM 2 value with the stream
selected and display off
Stream number
64 0 1
65 1 2
66 2 3
67 3 4
68 4 5
69 5 6
70 6 7
71 7 8
72 8 9
73 9 10
74 10 11
75 11 12
76 12 13
77 13 14
78 14 15
79 15 16
80 16 17
81 17 18
82 18 19
83 19 20
84 20 21
85 21 22
86 22 23
87 23 24
88 24 25
89 25 26
90 26 27
91 27 28
502 Chapter 20 Creating Scripts