Characteristic

Filter streams by “characteristic”. The following characteristics are supported:

• DVS, an audio track describing the action, generally timed to fit into pauses in the the dialog. This is also called “audio description”.
  In HLS, is tagged with CHARACTERISTICS="public.accessibility.describes-video".
  In DASH, a DVS stream includes an Accessibility element with schemeIdUri="urn:tva:metadata:cs:AudioPurposeCS:2007"
  
• Forced Narrative, a text track that clarifies communications or alternate languages meant to be understood by the viewer.
  In HLS, the attribute FORCED is set to the value YES.
  In DASH, under a text AdaptationSet, its role value is set to forced-subtitle`.

Protocol

HLS	DASH
yes	yes

Keys

name	key
characteristic	chr()

Values

values	example	description
dvs	chr(dvs)	Remove Descriptive Video Service
fn	chr(fn)	Remove Forced Narrative Text

Usage Example

$ http https://bakery.dev.vtg.paramount.tech/chr(dvs)/the_mighty_boosh/S01/E01.mpd
$ http https://bakery.dev.vtg.paramount.tech/chr(fn)/the_mighty_boosh/S01/E01.mpd
$ http https://bakery.dev.vtg.paramount.tech/chr(dvs,fn)/the_mighty_boosh/S01/E01.mpd