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AviExtractor supports text tracks (`AviExtractor.FOURCC_txts` -> `C.TRACK_TYPE_TEXT`) with subtitles. AviExtractor will no longer be wrapped in SubtitleTranscodingExtractor, but instead use SubtitleTranscodingExtractorOutput under the hood. FLAG_EMIT_RAW_SUBTITLE_DATA flag will be used to toggle between subtitle parsing during extraction (before the sample queue) or during decoding (after the sample queue). PiperOrigin-RevId: 598594981