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         CHAPTER 9                                                                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
         9.24.

                                TABLE 9.24 Entries in a timespan dictionary
KEY    TYPE                VALUE

Type   name                (Optional) The type of PDF object that this dictionary describes; if present, must be
                           Timespan for a timespan dictionary.

S      name                (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.

V      number              (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.

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