import type { FfmpegCommandPrototype } from '../types.js';
/**
 * Normalise the variadic shape of `inputOptions` / `outputOptions` /
 * `addOption` / etc. into a flat string[] suitable for ffmpeg argv.
 *
 * Three invocation forms (preserved from upstream `fluent-ffmpeg`):
 *
 *   cmd.inputOption('-ss 00:00:10')                // single string with space
 *   cmd.inputOptions('-c:v', 'libx264')            // positional varargs
 *   cmd.inputOptions(['-flag1 val1', '-flag2 v2']) // array of flag-value pairs
 *   cmd.inputOptions(['-headers', 'Cookie: a=b'])  // array of pre-split tokens
 *
 * The legacy split-on-space behaviour for array entries was over-eager:
 * `['-headers', 'Cookie: a=b']` had its second item split into
 * `['Cookie:', 'a=b']`, mangling the header value (upstream issue
 * #1151, open since 2021). The fix below splits an entry only when
 * its first part starts with `-` — distinguishing a flag-value pair
 * (`'-me_method umh'`, valid preset shape) from a value-with-space
 * (`'Cookie: a=b'`, raw user data).
 */
export declare function flattenOptions(args: (string | string[])[]): string[];
declare function applyCustomOptions(proto: FfmpegCommandPrototype): void;
export default applyCustomOptions;
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