用代码，做一支
61 秒的视频。

// 逐帧：不落盘，JPEG 直接推进 ffmpeg stdin
for (let i = 0; i < frames; i++) {
  const t = i / fps;
  await page.evaluate((tt) => window.renderFrame(tt), t);

  // 等两帧合成，确保 CDP 截到刷新后的 DOM / canvas
  await page.evaluate(() => new Promise((r) => requestAnimationFrame(() => requestAnimationFrame(r))));

  const shot = await cdp.send('Page.captureScreenshot', { format: 'jpeg', quality: 95 });
  const buf = Buffer.from(shot.data, 'base64');
  if (!ff.stdin.write(buf)) await new Promise((r) => ff.stdin.once('drain', r));
}

# 底鼓：正弦 120→45 Hz 扫频 + 高频 click + tanh
def synth_kick(f0=120.0, f1=45.0, dur=0.5, tau=0.13):
    n = smp(dur); t = tvec(n)
    f = f1 + (f0 - f1) * np.exp(-t / 0.030)
    ph = 2.0 * np.pi * np.cumsum(f) / SR
    body = np.sin(ph) * xenv_ad(n, 0.0015, tau)
    click = hp(RNG.standard_normal(n), 2500) * np.exp(-t / 0.0035) * 0.30
    return fade_tail(norm_peak(np.tanh(1.6 * (body + click)), 0.98), 8)

# 侧链总线：每个 kick 触发 55% 闪避，严格整数样本
def build_sidechain():
    duck = np.zeros(N)
    for s, w in DUCKS:
        m = min(env_len, N - s)
        cur = duck[s:s + m]
        np.maximum(cur, base[:m] * w, out=cur)
    return 1.0 - 0.55 * np.clip(duck, 0.0, 1.0)