Pojęcia - DASH 2

Media Presentation

collection of data that establishes a bounded or unbounded presentation of media content

Media Presentation Description - MPD

formalized description for a Media Presentation for the purpose of providing a streaming service

Media Presentation timeline

concatenation of the timeline of all Periods which itself is common to all Representations in the Period

Media Segment

Segment that complies with media format in use and enables playback when combined with zero or more preceding segments, and an Initialization Segment (if any)

media stream

encoded version of a media content component

Media Subsegment

Subsegment that only contains media data but no Segment Index

message

part of an event containing information that is exclusively handled by the event handler

MPD start time

approximate presentation start time of a Media Segment signalled in MPD

MPD duration

approximate presentation duration of a Media Segment signalled in MPD

Period

interval of the Media Presentation, where a contiguous sequence of all Periods constitutes the Media Presentation

presentation time

time associated to an access unit that maps it to the Media Presentation timeline

remote element entity

entity that contains one or more elements and is referenced in the MPD with an HTTP-URL contained in an @xlink: href attribute

Representation

collection and encapsulation of one or more media streams in a delivery format and associated with descriptive metadata

Segment

unit of data associated with an HTTP-URL and optionally a byte range that are specified by an MPD

Segment availability start time

latest time instant in wall-clock time at which a Segment becomes an available Segment

adjusted Segment availability start time

time instant in wall-clock time at which a Segment becomes an available Segment

Segment availability end time

time instant in wall-clock time at which a Segment ceases to be an available Segment

Segment Index

compact index of the time range to byte range mapping within a Media Segment separately from the MPD

stream access point - SAP

position in a Representation enabling playback of a media stream to be started using only the information contained in Representation data starting from that position onwards (preceded by initializing data in the Initialization Segment, if any)

Sub-Representation

part of a Representation described in the MPD that is present in the entire Period

Subsegment

unit within Media Segments that is indexed by a Segment Index