TextTrackFormat
public enum TextTrackFormat : Intextension TextTrackFormat: CodableDescribes the format of the text track.
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                  The text track is in the Web Video Text Tracks format. Remark In the native pipeline, for HLS streams use the sideloaded subtitles connector to put this format into effect. For more info, please check: https://github.com/THEOplayer/iOS-ConnectorDeclarationSwift case WebVTT = 1
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                  The text track is in the SubRip Text Tracks format. Remark Supported only when using the sideloaded subtitles connector. For more info, please check: https://github.com/THEOplayer/iOS-ConnectorDeclarationSwift case SRT = 2
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                  The raw value of type String. DeclarationSwift public var _rawValue: String { get set }
