jbibik b8e6f27caf Update SubtitleExtractor to use SubtitleParser directly
`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
2023-08-01 14:31:58 +01:00
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Extractor module

Provides media container extractors and related utilities. Application code will not normally need to depend on this module directly.