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The buffered position is currently based on the mimimum queued timestamp of all AV tracks. If the tracks have unequal lengths, one track continues loading without bounds as the "buffered position" will always stay at the shorter track's duration. This change adds an optional buffer flag to mark the last sample of the stream. This is set in the Mp4Extractor only so far. ExtractorMediaSource uses this flag to ignore AV streams in the buffered duration calculation if they already finished loading. Issue:#3670 PiperOrigin-RevId: 229359899