CHAPTER 9
776
Multimedia Features
TABLE 9.21 Additional entries in a media offset time dictionary
KEY
TYPE
VALUE
T
dictionary
(Required)
A timespan dictionary (see Table 9.24) that specifies a temporal offset
into a media object. Negative timespans are not allowed in this context. The media
offset time dictionary is non-viable if its timespan dictionary is non-viable.
TABLE 9.22 Additional entries in a media offset frame dictionary
KEY
TYPE
VALUE
F
integer
(Required)
Specifies a frame within a media object. Frame numbers begin at 0; neg-
ative frame numbers are not allowed.
TABLE 9.23 Additional entries in a media offset marker dictionary
KEY
TYPE
VALUE
M
text string
(Required)
A text string that identifies a named offset within a media object.
Timespan Dictionary
A
timespan dictionary
specifies a length of time; its entries are shown in Table
TABLE 9.24 Entries in a timespan dictionary
KEY
TYPE
VALUE
Type
name
name
(Optional)
The type of PDF object that this dictionary describes; if present, must be
Timespan
for a timespan dictionary.
(Required)
The subtype of timespan dictionary. The only value currently allowed is
S
(simple timespan). The rendition is considered non-viable if the viewer applica-
tion does not recognize the value of this entry.
(Required)
The number of seconds in the timespan. Non-integral values are al-
lowed. Negative values are allowed, but may be disallowed in some contexts (all sit-
uations defined in PDF 1.5 disallow negative values).
Note:
This entry is required only if the value of the
S
entry is
S
. Subtypes defined in the
future need not use this entry.
S
V
number