/**
 * @internal
 *
 * Calculates the duration of a segment.
 *
 * segmentDuration = duration / timescale
 *
 * @param duration - Duration of the segment
 * @param timescale - Timescale of the segment
 * @returns Segment duration
 */
export declare function calculateDuration(duration: string | undefined, timescale: string | undefined): number;
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