declare class VideoPreviewer {
    private video;
    private outputDir;
    private captions;
    readonly options: FFmpegOptions;
    private tempDir;
    private optionsStr;
    constructor(video: string, outputDir: string, captions?: Caption[], options?: FFmpegOptions);
    private cleanUp;
    private optionsToString;
    private ensureOutputDirExists;
    exec(): Promise<string>;
}

export { VideoPreviewer };