npx playwright --version
ffmpeg -version | head -1

await page.evaluate(() => {
  const scene = window.__GAME__.scene.getScene('GameScene');
  if (scene) {
    // Patch ALL paths to game over
    scene.triggerGameOver = () => {};
    scene.onPlayerHit = () => {};
    // For multi-life games, also prevent damage:
    // scene.takeDamage = () => {};
    // scene.playerDied = () => {};
  }
});

const holdMs = 150 + Math.floor(Math.random() * 450);
const pauseMs = 50 + Math.floor(Math.random() * 250);

await page.waitForFunction(() => window.__GAME__?.isBooted, { timeout: 15000 });
await page.waitForFunction(() => window.__GAME_STATE__?.started, { timeout: 10000 });

await page.evaluate(({ factor }) => {
  const game = window.__GAME__;
  const scene = game.scene.getScene('GameScene');

  // 1. Update delta — slows frame-delta-dependent logic
  const originalUpdate = scene.update.bind(scene);
  scene.update = function(time, delta) {
    originalUpdate(time, delta * factor);
  };

  // 2. Tweens — slows all tween animations
  scene.tweens.timeScale = factor;

  // 3. Scene timers — slows scene.time.addEvent() timers
  scene.time.timeScale = factor;

  // 4. Physics — slows Arcade/Matter physics
  // NOTE: Arcade physics timeScale is INVERSE (higher = slower)
  if (scene.physics?.world) {
    scene.physics.world.timeScale = 1 / factor;
  }

  // 5. Animations — slows sprite animation playback
  if (scene.anims) {
    scene.anims.globalTimeScale = factor;
  }
}, { factor: SLOW_MO_FACTOR });

const video = page.video();
await context.close();  // MUST close context to finalize the video file
const videoPath = await video.path();

import { chromium } from 'playwright';
import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const PROJECT_DIR = path.resolve(__dirname, '..');

// --- Config ---
const args = process.argv.slice(2);
function getArg(name, fallback) {
  const i = args.indexOf(`--${name}`);
  return i !== -1 && args[i + 1] ? args[i + 1] : fallback;
}

const PORT = getArg('port', '3000');
const GAME_URL = `http://localhost:${PORT}/`;
const VIEWPORT = { width: 1080, height: 1920 }; // 9:16 mobile portrait
const SLOW_MO_FACTOR = 0.5;
const DESIRED_GAME_DURATION = parseInt(getArg('duration', '13000'), 10);
const WALL_CLOCK_DURATION = DESIRED_GAME_DURATION / SLOW_MO_FACTOR;
const OUTPUT_DIR = path.resolve(PROJECT_DIR, getArg('output-dir', 'output'));
const OUTPUT_FILE = path.join(OUTPUT_DIR, 'promo-raw.webm');

// <ADAPT: Generate game-specific input sequence>
function generateInputSequence(totalMs) {
  const sequence = [];
  let elapsed = 0;

  // Pause for entrance animation
  sequence.push({ key: null, holdMs: 0, pauseMs: 1500 });
  elapsed += 1500;

  // <ADAPT: Replace with game-specific keys and timing>
  const keys = ['ArrowLeft', 'ArrowRight'];
  let keyIdx = 0;

  while (elapsed < totalMs) {
    const holdMs = 150 + Math.floor(Math.random() * 450);
    const pauseMs = 50 + Math.floor(Math.random() * 250);

    // Occasional double-tap for variety
    if (Math.random() < 0.15) {
      sequence.push({ key: keys[keyIdx], holdMs: 100, pauseMs: 60 });
      elapsed += 160;
    }

    sequence.push({ key: keys[keyIdx], holdMs, pauseMs });
    elapsed += holdMs + pauseMs;

    // Alternate direction (with occasional same-direction repeats)
    if (Math.random() < 0.75) keyIdx = 1 - keyIdx;
  }

  return sequence;
}

async function captureGameplay() {
  console.log('Capturing promo video...');
  console.log(`  URL: ${GAME_URL} | Viewport: ${VIEWPORT.width}x${VIEWPORT.height}`);
  console.log(`  Game duration: ${DESIRED_GAME_DURATION}ms | Wall clock: ${WALL_CLOCK_DURATION}ms`);

  fs.mkdirSync(OUTPUT_DIR, { recursive: true });

  const browser = await chromium.launch({ headless: true });
  const context = await browser.newContext({
    viewport: VIEWPORT,
    recordVideo: { dir: OUTPUT_DIR, size: VIEWPORT },
  });

  const page = await context.newPage();
  await page.goto(GAME_URL, { waitUntil: 'networkidle' });

  // Wait for game boot + gameplay active
  await page.waitForFunction(() => window.__GAME__?.isBooted, { timeout: 15000 });
  await page.waitForFunction(() => window.__GAME_STATE__?.started, { timeout: 10000 });
  await page.waitForTimeout(300);
  console.log('  Game active.');

  // <ADAPT: Patch out death — find the actual methods from GameScene.js>
  await page.evaluate(() => {
    const scene = window.__GAME__.scene.getScene('GameScene');
    if (scene) {
      scene.triggerGameOver = () => {};
      scene.onPlayerHit = () => {};
    }
  });
  console.log('  Death patched.');

  // Slow all 5 Phaser time subsystems
  await page.evaluate(({ factor }) => {
    const game = window.__GAME__;
    const scene = game.scene.getScene('GameScene');
    const originalUpdate = scene.update.bind(scene);
    scene.update = function(time, delta) { originalUpdate(time, delta * factor); };
    scene.tweens.timeScale = factor;
    scene.time.timeScale = factor;
    if (scene.physics?.world) scene.physics.world.timeScale = 1 / factor;
    if (scene.anims) scene.anims.globalTimeScale = factor;
  }, { factor: SLOW_MO_FACTOR });
  console.log(`  Slowed to ${SLOW_MO_FACTOR}x.`);

  // Execute input sequence
  const sequence = generateInputSequence(WALL_CLOCK_DURATION);
  console.log(`  Playing ${sequence.length} inputs over ${WALL_CLOCK_DURATION}ms...`);

  for (const seg of sequence) {
    if (!seg.key) { await page.waitForTimeout(seg.pauseMs); continue; }
    await page.keyboard.down(seg.key);
    await page.waitForTimeout(seg.holdMs);
    await page.keyboard.up(seg.key);
    if (seg.pauseMs > 0) await page.waitForTimeout(seg.pauseMs);
  }

  console.log('  Input complete.');

  // Finalize video
  const video = page.video();
  await context.close();
  const videoPath = await video.path();

  if (videoPath !== OUTPUT_FILE) {
    fs.renameSync(videoPath, OUTPUT_FILE);
  }

  await browser.close();
  console.log(`  Raw recording: ${OUTPUT_FILE}`);
  console.log('Done.');
}

captureGameplay().catch(err => { console.error('Capture failed:', err); process.exit(1); });

undefined

The script:
- Applies `setpts` to speed up the video by `1/factor`
- Sets output framerate to `25 / factor` (= 50 FPS for 0.5× slow-mo)
- Encodes H.264 with `crf 23`, `yuv420p`, `faststart`
- Verifies output duration, frame rate, and file size