promo-video
Installation
SKILL.md
Promo Video Recording
Record smooth, autonomous promo footage of a Phaser game for marketing / social media. The output is a 50 FPS MP4 in mobile portrait (9:16) — ready for TikTok, Reels, Moltbook, or X.
Technique
Playwright's recordVideo caps at 25 FPS with no config option. We work around it:
- Slow the game to 0.5× by patching all 5 Phaser time subsystems
- Record for 2× the desired duration at Playwright's native 25 FPS
- FFmpeg speed-up 2× → effective 50 FPS output
| Parameter | Default | Effect |
|---|---|---|
SLOW_MO_FACTOR |
0.5 |
Game runs at half speed → 50 FPS output |
WALL_CLOCK_DURATION |
DESIRED_GAME_DURATION / SLOW_MO_FACTOR |
Record for 2× to get correct game-time |
VIEWPORT |
{ width: 1080, height: 1920 } |
9:16 mobile portrait (always default unless user specifies otherwise) |
DESIRED_GAME_DURATION |
13000 (ms) |
~13s of game-time → ~6.5s promo clip |