import type { Logger } from "../utils/logger.js";
import type { OutputFormat } from "../types/audio.js";
export declare function ffmpegInstallGuidance(): string;
export declare function checkFfmpegAvailability(): Promise<void>;
export declare function listEncoders(): Promise<Set<string>>;
/** Reset encoder cache (tests). */
export declare function clearEncoderCache(): void;
export declare function resolveEncoder(format: OutputFormat): Promise<string>;
export declare function checkEncoderAvailable(format: OutputFormat): Promise<string>;
export interface FfmpegRunOptions {
    args: string[];
    logger?: Logger;
    friendlyName?: string;
    durationSeconds?: number | null;
}
export declare function runFfmpeg(options: FfmpegRunOptions): Promise<{
    stdout: string;
    stderr: string;
}>;
export declare function commonAudioInputArgs(inputPath: string): string[];