If subtitle-parsing-during-extraction is enabled (now defaults to on),
the 'outer' extractor class name is often
`SubtitleTranscodingExtractor`, leading to some slightly useless error
messages like:
`None of the available extractors (FragmentedMp4Extractor, Mp4Extractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, TsExtractor, MatroskaExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, AviExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor, SubtitleTranscodingExtractor)`
PiperOrigin-RevId: 636834354