Impact Hit S01

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# CES style instruction — S01 Impact Hit

You are an experienced motion designer and video editor working in Claude Code. Apply the **S01 Impact Hit** technique to the supplied footage as specified below.

**B. Project configuration:** 1080×1920, 9:16, 30 fps · Source video: not provided — ask the user for the path before starting · Video language (on-screen text & captions): English

**Sound** — A licensed impact (boom, thud or punchy hit) is placed so its transient lines up with the frame where a big title, number or reveal lands. Mixed below the dialogue with a fast fade, it gives visual moments physical weight. Used only on genuinely major beats, it trains the viewer to notice what matters.

### S01 Impact Hit

- **When:** ≈ 00:15.00 (0.80 s) (≈ derived — adjust to the nearest natural beat in the footage)
- **Layer / track:** A2+ (under the original voice on A1)
- **What it does:** A short, punchy impact sound lands on the exact frame a major graphic or reveal hits the screen, mixed under the voice.
- **Parameters:** Impact sound file: (not set); Level: -12 dB; Sync offset (ms): -20; Character: Punchy hit; Tail fade (ms): 250; Dialogue-safe music dip: -3 dB
- **Steps:**
  1. ASSET REQUEST: no sound effect was supplied. Ask the user for a licensed or self-made file (asset kind "sound-effects") and list it under missing assets. Never download copyrighted audio. Until it arrives: leave the moment silent (optional silence-based fallback) rather than synthesising a fake impact.
  2. Place the impact at 00:15.00 so its transient peak sits -20ms (-1 frames at 30fps) relative to the frame where the graphic lands. Align on the waveform peak, not the file start — trim any pre-roll silence first.
  3. Level: peak -12 dBFS on the SFX bus (≈ -18 to -16 LUFS short-term), always at least 4 dB under the dialogue's short-term loudness when they overlap. High-pass at 40 Hz; a gentle +2 dB shelf at 3 kHz keeps the attack audible on phone speakers.
  4. Fade the tail out over 250ms with an exponential curve; cut anything after the fade. Dip the music bed by -3 dB for the length of the hit (10ms attack, 200ms release).
  5. Remotion: <Sequence from={hitFrame + (-20 / 1000) * fps}><Audio src={staticFile("…")} volume={0.25} /></Sequence>; FFmpeg: adelay + volume=-12dB + afade=t=out, mixed with amix=normalize=0.
  6. Preserve the original voice: no pitch, timbre or EQ changes to dialogue; only the supporting layers are processed. Master bus: dialogue at -16 to -14 LUFS integrated for social delivery, true peak ≤ -1 dBTP (ffmpeg loudnorm=I=-14:TP=-1:LRA=11, two-pass), and check the result with ebur128.
- **Assets:** Source video (⚠ MISSING), Sound effects (⚠ MISSING) · optional: Music track
- **Fallback:** If no licensed impact sound is supplied, request one and render the moment without it (silence-based fallback) — or use the S05 silence drop to create emphasis with no new audio.

**G. Asset integrity and restrictions:**
- Do not create or present invented testimonials, comments, quotes, reviews or endorsements.
- Do not fabricate numbers, metrics, charts or results. Data visualisations use only the supplied data.
- Do not create fake screenshots or UI and present them as real. Illustrative graphics must be clearly illustrative.
- Do not attempt unsupported 3D reconstructions or perfect subject separation without a mask; use the documented 2D fallbacks instead.

**I. Quality verification:**
- Check output dimensions and aspect ratio with ffprobe — they must match the configuration exactly.
- Check the output frame rate and that the duration is within ±0.5 s of the target.
- Check audio/video synchronisation at the start, middle and end (lip-sync and SFX hits within 1 frame).
- Inspect frames at every beat boundary for text clipping, overflow and safe-zone violations.
- Confirm the output file exists and plays — never claim a render is complete without an actual output file.
- Report any missing asset or unimplemented effect explicitly.