/**
 * Screenshot related utilities
 */
/**
 * Capture screenshot from video element
 * @param videoElement Video element to capture
 * @param options Capture options
 * @returns DataURL of image (JPEG), null if failed
 */
export declare function captureScreenshot(videoElement: HTMLVideoElement, options?: {
    format?: 'image/jpeg' | 'image/png';
    quality?: number;
}): string | null;
/**
 * Convert DataURL to Blob
 * @param dataUrl DataURL of image
 * @returns Blob object
 */
export declare function dataUrlToBlob(dataUrl: string): Promise<Blob>;