import { Flow } from '../core/flow';
import { VoidCallback } from '../common-types';
export declare class ConcatMp4sFlow extends Flow {
    private _movUrl1;
    private _movUrl2;
    private _toggleConcatOrder;
    /**
       * @param _movUrl1 First file URL
       * @param _movUrl2 Second file URL
       * @param _allowReencode defaults to true. when true will re-encode to Bs tracks to As respective audio/video configurations
       * @param _toggleConcatOrder defaults to false. if true will toggle order of concatenation (B before A, but not changing re-encode behavior of course)
       */
    constructor(_movUrl1: string, _movUrl2: string, downloadEl?: HTMLElement, _toggleConcatOrder?: boolean);
    private _setup;
    protected onVoidToWaiting_(done: VoidCallback): void;
    protected onWaitingToVoid_(done: VoidCallback): void;
    protected onWaitingToFlowing_(done: VoidCallback): void;
    protected onFlowingToWaiting_(done: VoidCallback): void;
    protected onCompleted_(done: VoidCallback): void;
    protected onStateChangeAborted_(reason: string): void;
}