The sample start time, in timescale units, relative to the media.
The presentation start time of the period, relative to the MPD timeline.
Specifies a presentation time offset in the media timeline relative to the start of the Period, in timescale units, used to adjust the timing of media presentation.
The timescale, in units per second.
Converts a sample time to an MPD-relative time.
The samples within a representation exist on a linear sample timeline defined by the encoder. This function maps those sample times onto the MPD timeline.
https://dashif-documents.azurewebsites.net/Guidelines-TimingModel/master/Guidelines-TimingModel.html