export declare const CUT_DEFAULT_WIDTH = 1280;
export declare const CUT_DEFAULT_HEIGHT = 720;
export interface BuildSegmentCutArgsInput {
    /** Source clip to cut from. */
    clipPath: string;
    /** Input-seek point in seconds (the lip-sync scrub offset / B-roll in-point). */
    inSeconds: number;
    /** Desired segment duration; quantized to an exact whole number of frames. */
    durationSec: number;
    /** Where the cut segment is written. */
    outputPath: string;
    /** Output frame width (default 1280). */
    width?: number;
    /** Output frame height (default 720). */
    height?: number;
    /** Output frame rate (default 24, matching {@link TARGET_FPS}). */
    fps?: number;
    /** x264 CRF (default 18). */
    crf?: number;
    /** x264 preset (default 'veryfast' — segments are re-graded later in one pass). */
    preset?: string;
    /** Keep source audio? Default false (`-an`); montage audio is muxed at the end. */
    keepAudio?: boolean;
}
/** Exact whole-frame count for a segment duration (>= 1). */
export declare function segmentFrameCount(durationSec: number, fps?: number): number;
/**
 * Build the FFmpeg args for one frame-exact segment cut. PURE — the returned
 * array is everything AFTER `ffmpeg -y`. Outputs exactly
 * `segmentFrameCount(durationSec, fps)` frames starting at `inSeconds`.
 */
export declare function buildSegmentCutArgs(input: BuildSegmentCutArgsInput): string[];
/**
 * Assert the built (concatenated) video length matches the planned length to
 * within one frame. Throws with a descriptive message otherwise. Use this as
 * the post-build gate on any audio-synced assembly so cumulative drift can never
 * silently regress.
 */
export declare function assertNoDrift(plannedSeconds: number, builtSeconds: number, fps?: number): void;
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