8336d7a60b
According to ISO/IEC 23009-1:2014(E), chapter 5.3.2.1 "The Period extends until the PeriodStart of the next Period, or until the end of the Media Presentation in the case of the last Period." This means that a configured value for optional attribute period duration should be ignored if the next period contains a start attribute or it is the last period and the MPD contains a mediaPresentationDuration attribute. https://bugzilla.gnome.org/show_bug.cgi?id=750797