/**
 * Shared audio prep for STT providers that want 16 kHz mono PCM WAV.
 */
import { type TranscribeProvider } from './transcribe-types.js';
/**
 * Convert any ffmpeg-readable file to 16 kHz mono PCM WAV.
 * Already-WAV inputs are copied through (no re-encode) so unit tests and
 * hosts without ffmpeg can still exercise cloud STT HTTP paths.
 */
export declare function convertToWav(inputPath: string, outputPath: string, provider?: TranscribeProvider): Promise<void>;
//# sourceMappingURL=transcribe-audio.d.ts.map