.. meta::
  :description lang=en: I-MPD Redundant Encoding and Packaging
  :keywords: guidelines, implementation, REaP, I-MPD

.. |validator| replace:: *Validator*
.. _validator: https://validator.unified-streaming.com

Ingest MPD I-MPD
================

|validator|_ implements checks to assert conformance to ISO/IEC 23009-9 6.2.
This is ingest MPD format used for ingest (this is only critical for ingest to unified origin).

.. contents:: Table of Contents
  :local:
  :depth: 1


ISO IEC 23009-9 6.2  REaP I-MPD

Should Fix 6.2.2a
-----------------	
The MPD@availabilityStartTime should be set to 1970-01-01T00:00:00Z 

Should Fix 6.2.2b
-----------------  
The Period @start should be set to PT0S or a semantically equivalent value. 

Must Fix 6.2.2b (not implemented)
---------------------------------
If this is not the case, the SegmentTemplate@presentationTimeOffset shall be used 
to achieve epoch relative timing instead.

Must Fix Clause 6.2.3
---------------------   
The I-MPD shall contain a single Period element.

Must Fix 6.2.4   
--------------
The Period.@BaseURL element shall be absent.  

Must Fix 6.2.5   
--------------
EventStream elements shall not be used to signal 
time varying metadata if there is no  frequent update of the I-MPD. 

Must Fix 6.2.6   
--------------
The I-MPD shall contain a SegmentTemplate element in each 
AdaptationSet element but none shall be present in a Representation Element.

Must Fix 6.2.7   
--------------
The AdaptationSet.@BaseURL element shall be absent. 

Must Fix 6.2.9
--------------

The SegmentTemplate@initialization in the I-MPD shall 
contain a single substring $RepresentationID$ and the 
SegmentTemplate@media shall contain a single substring 
$RepresentationID$ and a single substring $Number$ or $Time$ 
(not both). A separator character (- or _) shall be between 
$Representation$ and $Number$ or $Time$ if one or more 
Representation@id ends with a number. 

Must Fix 6.2.10.
----------------	
SegmentTemplate@media shall 
be identical for each SegmentTemplate element 

Must Fix 6.2.11.
----------------
SegmentTemplate@initialization shall be identical for each SegmentTemplate element 

Should Fix 6.2.12.	
------------------
Each SegmentTemplate element should contain a SegmentTimeline element.
A SegmentTimeline element may be empty.