In a static presentation, the last period SHALL have a Period@duration.
In a dynamic presentation, the first period SHALL start at or after the zero point of the MPD timeline (with a
Period@start value of 0 seconds or greater).
In a dynamic presentation, the last period MAY have a Period@duration, in which case it has a fixed duration. If
without Period@duration, the last period in a dynamic presentation has an unlimited duration (that may later be
shortened by an MPD update).
In a static presentation, the last period SHALL have a Period@duration.
In a dynamic presentation, the first period SHALL start at or after the zero point of the MPD timeline (with a Period@start value of 0 seconds or greater).
In a dynamic presentation, the last period MAY have a Period@duration, in which case it has a fixed duration. If without Period@duration, the last period in a dynamic presentation has an unlimited duration (that may later be shortened by an MPD update).