/**
 * EDL (Edit Decision List) authoring and validation.
 *
 * The EDL is a JSON document the LLM reads and mutates. This module
 * provides helpers that keep invariants tight: no negative durations,
 * every `sourceId` resolves, transition ms within ffmpeg's sensible
 * range, output settings present.
 */
import type { Edl, EdlClip, EdlTransition, Take } from './types.js';
export declare const DEFAULT_EDL_OUTPUT: Edl['output'];
export declare const DEFAULT_AUDIO_FADE_MS = 30;
export declare const DEFAULT_TRANSITION_MS = 250;
export interface CreateEdlOptions {
    audioFadeMs?: number;
    output?: Partial<Edl['output']>;
}
export declare function createEmptyEdl(options?: CreateEdlOptions): Edl;
export interface EdlValidationError {
    clipIndex: number;
    message: string;
}
export declare function validateEdl(edl: Edl, takes: Take[]): EdlValidationError[];
/** Effective clip duration in seconds after applying trimStart/trimEnd. */
export declare function effectiveDurationSec(clip: EdlClip): number;
/** Sum of clip durations minus crossfade overlaps. */
export declare function estimateOutputDurationSec(edl: Edl): number;
export interface AddClipInput {
    sourceId: string;
    startSec: number;
    endSec: number;
    trimStartMs?: number;
    trimEndMs?: number;
    transitionIn?: EdlTransition;
    transitionMs?: number;
    rationale?: string;
}
export declare function addClip(edl: Edl, input: AddClipInput): void;
/**
 * Insert a crossfade at a cut boundary (between clip `i - 1` and `i`).
 * Used by the cut-qa agent's `insert-crossfade` fix.
 */
export declare function insertCrossfade(edl: Edl, clipIndex: number, transitionMs?: number): void;
export declare function readEdl(path: string): Edl;
export declare function writeEdl(edl: Edl, path: string): void;
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