export interface FfmpegRunOptions {
    /** Path or basename of the ffmpeg binary. Defaults to `ffmpeg` (resolved via PATH). */
    ffmpegPath?: string;
    /** Wall-clock cap on the ffmpeg process (ms). Default 5 minutes. */
    timeoutMs?: number;
    /** Cap on captured stderr bytes (used in error messages). Default 8 KiB. */
    maxStderrBytes?: number;
}
export declare class FfmpegFailedError extends Error {
    readonly stderr: string;
    readonly exitCode: number | null;
    constructor(message: string, stderr: string, exitCode: number | null);
}
export declare class FfmpegTimeoutError extends Error {
    constructor(message: string);
}
/**
 * Runs ffmpeg with the given args, feeding `input` to stdin and returning
 * stdout as a Buffer. stderr is captured up to a byte cap and surfaced in any
 * thrown error. Times out after `timeoutMs` (default 5 min).
 */
export declare function runFfmpeg(args: string[], input: Buffer, opts?: FfmpegRunOptions): Promise<Buffer>;
/**
 * Runs `ffmpeg -version` once to verify ffmpeg is on PATH. Intended to be
 * cached at server start and not re-probed.
 */
export declare function probeFfmpegAvailable(ffmpegPath?: string): Promise<boolean>;
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