| 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. |
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| 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, description and dub. See DASH (ISO/IEC 23009-1) specification for details. |