Does MPEG-Dash live have ?begin parameter in their URI to start playback from a particular position

Question

I have a MPEG-DASH URI like below

https://test.com/default/index.mpd?begin=20230222T120430

where i have begin parameter specifying from where to start the playback. This is a dynamic MPD.

I want to know is begin parameter a standard parameter of MPEG-DASH. If yes, then in which document this parameter is specified.

Answer 1

MPEG-DASH is specified in ISO23009-1 - currently available at https://www.iso.org/standard/83314.html - which is the document in which begin would be specified if it were part of the DASH specification.

Appendix C.4 lays out a couple of MPD anchors for use in starting the stream at a particular time, but begin is not one of them.

Note that many players will not implement these anchors even though they are in the specification.