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Dash-Industry-Forum / Guidelines-TimingModel

DASH-IF implementation guidelines: the DASH timing model
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What does " If the MPD@availabilityStartTime is maintained for a portion of the live program that is offered in the static MPD" mean? #28

Closed sandersaares closed 4 years ago

sandersaares commented 5 years ago

IOP v4.3 section 4.6.2 talking about dynamic->static conversion says:

If the MPD@availabilityStartTime is maintained for a portion of the live program that is offered in the static MPD the Period@start value (including the presentation time offset and the start number) and the presentation duration shall be set accordingly. The relationship to the wall-clock time should be maintained by offsetting the Period@start without changing the MPD@availabilityStartTime.

I do not understand what it means for AST to "be maintained" in this context. What exactly is the situation where you want to preserve some value of AST here in some sort of relationship with the live service that becomes an on-demand recording?

haudiobe commented 5 years ago

We can prohibit this case and remove it in v5.

sandersaares commented 4 years ago

Addressed in timing model.