Characteristics that mark an audio rendition as an audio description (a.k.a.
described video / DVS) — narration of on-screen action for viewers who cannot
see it. HLS signals this with the public.accessibility.describes-video
CHARACTERISTIC; DASH with a description Role. Such renditions must not be
chosen as the default audio; they are an accessibility opt-in.
Characteristics that mark an audio rendition as an audio description (a.k.a. described video / DVS) — narration of on-screen action for viewers who cannot see it. HLS signals this with the
public.accessibility.describes-videoCHARACTERISTIC; DASH with adescriptionRole. Such renditions must not be chosen as the default audio; they are an accessibility opt-in.