export declare function ensureTestdataDir(relativeDir: string): Promise<string>;
export declare function defaultDownloadDir(): string;
export declare function defaultOutputDir(): string;
/** True when the source already lives under testdata/downloads. */
export declare function isUnderTestdataDownloads(inputPath: string): boolean;
/**
 * If the source already lives under testdata/downloads, restored files go to
 * output/. Only the directory is decided here — the extension depends on whether
 * the input carries a picture track, which is not known until it is probed.
 */
export declare function preferTestdataOutputDir(inputPath: string): string | null;