shaka-packager/docs/source/options/dash_stream_descriptors.rst

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DASH specific stream descriptor fields
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
:dash_accessibilities (accessibilities):
Optional semicolon separated list of values for DASH Accessibility element.
The value should be in the format: scheme_id_uri=value, which propagates
to the Accessibility element in the result DASH manifest. See DASH
(ISO/IEC 23009-1) specification for details.
:dash_roles (roles):
optional semicolon separated list of values for DASH Role element. The
value should be one of: **caption**, **subtitle**, **main**, **alternate**,
**supplementary**, **commentary**, **dub**, **description**, **sign**,
**metadata**, **enhanced-audio- intelligibility**, **emergency**,
**forced-subtitle**, **easyreader**, and **karaoke**.
See DASH (ISO/IEC 23009-1) specification for details.