export interface TransientResult {
    path: string;
    /** Seconds from file start where the first audible event begins, or null. */
    transientSec: number | null;
}
export interface MulticamSyncResult {
    /** Path used as the t=0 reference (transient closest to file start). */
    reference: string;
    results: Array<{
        path: string;
        /** Positive = file starts later than reference. null = no transient detected. */
        offsetSec: number | null;
        transientSec: number | null;
    }>;
    thresholdDb: number;
    /** Set if any input had no detectable transient. */
    warning?: string;
}
/**
 * Detect the first transient (end of leading silence) in a media file.
 *
 * Runs `silencedetect` with a strict noise floor and a long min-silence so the
 * lead-in counts as silence; the first `silence_end` is the first audible event.
 */
export declare function detectFirstTransient(inputPath: string, opts?: {
    thresholdDb?: number;
    minSilenceSec?: number;
    signal?: AbortSignal;
}): Promise<TransientResult>;
/**
 * Align 2+ inputs by their first transient. Pick the input with the smallest
 * transient as reference (transient at t=0 in the synced timeline). Other
 * offsets = transient[i] - reference.transient.
 */
export declare function multicamSync(inputPaths: string[], opts?: {
    thresholdDb?: number;
    minSilenceSec?: number;
    signal?: AbortSignal;
}): Promise<MulticamSyncResult>;
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