exposeCea608WhenMissingDeclarations - Whether created TsExtractor instances should
expose a CEA-608 track should the master playlist contain no Closed Captions declarations.
If the master playlist contains any Closed Captions declarations, this flag is ignored.
previousExtractor - A previously used Extractor which can be reused if the current
chunk is a continuation of the previously extracted chunk, or null otherwise. It is the
responsibility of implementers to only reuse extractors that are suited for reusage.
uri - The URI of the media chunk.
format - A Format associated with the chunk to extract.
muxedCaptionFormats - List of muxed caption Formats. Null if no closed caption
information is available in the master playlist.