/**
 * Video frame extraction (ffmpeg) and GPT-4o-mini vision analysis.
 * Extracted from openai.ts for modular decomposition (Phase 3).
 */
/**
 * Register process-exit handlers that clean up in-flight temp files,
 * and run an initial sweep of stale files in TEMP_DIR.
 *
 * Call once during application bootstrap (not at import time).
 */
export declare function initVideoTempCleanup(): void;
/** Maximum number of frames to extract from a video. */
export declare const MAX_FRAMES = 6;
/**
 * Extract key frames from a video buffer using ffmpeg.
 * Writes video to a temp file and reads JPEG frames from stdout.
 * @param videoBuffer  Raw video file content (MP4).
 * @param durationSec  Video duration in seconds (used to calculate interval).
 * @returns Array of JPEG-encoded frame buffers.
 */
export declare function extractVideoFrames(videoBuffer: Buffer, durationSec: number): Promise<Buffer[]>;
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