import type { Session } from '../types.js';
import type { CaptionEntry } from '../captions/generator.js';
export interface CompositorOptions {
    session: Session;
    frameDir: string;
    frameCount: number;
    audioPath?: string;
    captionEntries?: CaptionEntry[];
    captionDir?: string;
    onProgress?: (pct: number) => void;
}
export interface CompositorResult {
    outputPath: string;
    durationSec: number;
}
export declare function checkFfmpeg(): Promise<boolean>;
export declare const PLATFORM_PROFILES: Record<string, {
    width: number;
    height: number;
    fps: number;
    maxDuration: number;
    bitrate: string;
}>;
export declare function compositeMultiPlatform(opts: CompositorOptions): Promise<CompositorResult[]>;
export declare function compositeVideo(opts: CompositorOptions): Promise<CompositorResult>;