/**
 * OpenAI vision services: video frame analysis (GPT-4o-mini).
 *
 * Extracted from openai.ts for modular decomposition (Phase 3C).
 */
/**
 * Analyze video frames using OpenAI GPT-4o-mini vision.
 * @param frames     Array of JPEG frame buffers.
 * @param durationSec  Video duration for timestamp context.
 * @param apiKey     OpenAI API key.
 * @returns Human-readable description of the video content.
 */
export declare function analyzeVideoFrames(frames: Buffer[], durationSec: number, apiKey: string): Promise<string>;
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