/**
 * handlers/mp4.ts — MP4 / MOV / M4A / M4V handler
 *
 * ISO Base Media File Format (ISOBMFF) — the container used by MP4, MOV, M4A, M4V.
 * Structure is a tree of "boxes" (also called "atoms"), each with:
 *   [4B size][4B type][...data/children]
 *
 * We embed in the `udta` (user data) box inside `moov`, which is the standard
 * location for custom metadata in MP4/MOV files. QuickTime and ffmpeg preserve it.
 *
 * Strategy:
 *   moov → udta → majk (our custom 4-char type)
 *
 * If udta doesn't exist in moov, we create it.
 * If moov doesn't exist (fragmented MP4), fall through to FallbackHandler.
 */
import { FormatHandler } from "../../types";
export declare class Mp4Handler implements FormatHandler {
    readonly name = "MP4/MOV";
    readonly supportedMimeTypes: readonly ["video/mp4", "video/quicktime", "audio/mp4", "audio/m4a", "video/x-m4v", "video/m4v"];
    canHandle(bytes: Uint8Array, mimeType?: string): boolean;
    embed(bytes: Uint8Array, signatureJson: string): Promise<Uint8Array>;
    extract(bytes: Uint8Array): Promise<string | null>;
    strip(bytes: Uint8Array): Promise<Uint8Array>;
    private _parseBoxes;
    private _buildBox;
}