/**
 * PSNR (average, dB) between two same-dimension encoded images via ffmpeg.
 * Infinity means bit-identical pixels. Single source of truth for every
 * drawElement self-verify comparison (streaming drain + parallel disk path).
 */
export declare function psnrDb(a: Buffer, b: Buffer): Promise<number>;
/**
 * The drawElement self-verify PSNR floor (dB). HF_DE_VERIFY_MIN_DB overrides,
 * clamped to [10, 60]; out-of-range or unset falls back to 32 — the threshold
 * every prior eval used to separate real compositor damage from encoder noise.
 */
export declare function resolveDeVerifyMinDb(): number;
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