/**
 * Check for WebCodecs support on the current platform.
 * @type {boolean}
 */
export const isWebCodecsSupported: boolean;
export function downloadBlob(filename: any, blobPart: any, mimeType: any): void;
export function captureCanvasRegion(canvas: any, x: any, y: any, width: any, height: any): any;
export function formatDate(date: any): any;
export function formatSeconds(seconds: any): string;
export function nextMultiple(x: any, n?: number): number;
export class Deferred {
    resolve: (value: any) => void;
    reject: (reason?: any) => void;
    promise: Promise<any>;
}
/**
 * Estimate the bit rate of a video rounded to nearest megabit.
 * Based on "H.264 for the rest of us" by Kush Amerasinghe.
 *
 * @example
 * ```js
 * // Full HD (1080p)
 * const bitRate = estimateBitRate(1920, 1080, 30, "variable");
 * const bitRateMbps = bitRate * 1_000_000; // => 13 Mbps
 * ```
 *
 * @param {number} width
 * @param {number} height
 * @param {number} frameRate
 * @param {number} motionRank A factor of 1, 2 or 4
 * @param {"variable" | "constant"} bitrateMode
 * @returns {number} A bitrate value in bits per second
 */
export function estimateBitRate(width: number, height: number, frameRate?: number, motionRank?: number, bitrateMode?: "variable" | "constant"): number;