/**
 * Frame Extractor for Director Mode
 *
 * Extracts first and last frames from MP4 video buffers using FFmpeg.
 * Used by Director Mode to obtain boundary frames for Veo 3.1
 * first-and-last-frame interpolation transitions.
 *
 * Uses the shared FFmpeg adapter for binary resolution, temp file management,
 * and process execution — following the adapter pattern in `adapters/tts/`.
 *
 * @module adapters/video/frameExtractor
 */
/**
 * Extract the first frame from a video buffer as JPEG.
 *
 * @param videoBuffer - MP4 video buffer
 * @returns JPEG image buffer of the first frame
 * @throws {VideoError} If buffer validation or extraction fails
 */
export declare function extractFirstFrame(videoBuffer: Buffer): Promise<Buffer>;
/**
 * Extract the last frame from a video buffer as JPEG.
 *
 * @param videoBuffer - MP4 video buffer
 * @returns JPEG image buffer of the last frame
 * @throws {VideoError} If buffer validation or extraction fails
 */
export declare function extractLastFrame(videoBuffer: Buffer): Promise<Buffer>;