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SubtitleExtractor is using IndexSeekMap with only one position to indicate that its output is seekable. SubtitleExtractor is keeping Cues in memory anyway so more seek points are not needed. SubtitleExtractor gets notified about seek occurrence through seek() method. Inside that method extractor saves seekTimeUs, and on the next call to read() extractor outputs all cues that should be displayed at this time and later. PiperOrigin-RevId: 395477127