Original Language Protection

Features should retain their original sound track against audio (“a()”) filters, even when it is not a normally-provided language for the locale. For example, Amélie was filmed in French; that track should be included even in Mexico, where otherwise the standard languages might be English and Spanish. Since there is no equivalent to the Wiki Data type P364, the following are used to identify original language in HLS/DASH:

• DASH: Role = Main
• HLS: Default = True