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`SubtitleExtractor` used to rely on a `SubtitleDecoder`. However, now all SubtitleDecoders that are used for side-loaded subtitles have been migrated to a `SubtitleParser` interface. We can therefore refactor the extractor. The `SubtitleExtractor` is only used for side-loaded subtitles which means we do not require the migration of the CEA-608/708 `SubtitleDecoders`. PiperOrigin-RevId: 552471710