Pojęcia - DASH

access unit

unit of a media stream with an assigned Media Presentation time

accessibility

degree to which a media content or certain media content components are available to as many people as possible

Adaptation Set

set of interchangeable encoded versions of one or several media content components

asset

content including media and metadata together with the rights to use the content by the content provider

available Segment

Segment that is accessible at its assigned HTTP-URL and a possibly assigned byte range that is the request with an HTTP GET results in a reply of the Segment and 2xx status code

Bitstream Switching Segment

Segment that if present contains essential data to switch to the Representation it is assigned to

complementary Representation

Representation which complements at least one dependent Representation

continuous media

media with an inherent notion of time, for example, speech, audio, video, timed text or timed metadata

DASH metric

metric identified by a key and defined in this part of ISO/IEC 23009

dependent Representation

Representation for which Segments from its complementary Representations are necessary for presentation and/or decoding of the contained media content components

earliest presentation time

smallest presentation time of any access unit of a Media Segment or Subsegment for a media stream

event

aperiodic sparse media-time related auxiliary information to the DASH client or to an application

event stream

sequence of related events

group

collection of Adaptation Sets that are not expected to be presented simultaneously

HTTP-URL

URL with a fixed scheme of “http” or “https”

Index Segment

Segment that primarily contains indexing information for Media Segments

Initialization Segment

Segment containing metadata that is necessary to present the media streams encapsulated in Media Segments

media content

one media content period or a contiguous sequence of media content periods

media content component

one continuous component of the media content with an assigned media component type that can be encoded individually into a media stream

media content component type

single type of media content such as audio, video, or text

media content period

set of media content components that have a common timeline as well as relationships on how they can be presented