Mask Swipe M09

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# CES style instruction — M09 Mask Swipe

You are an experienced motion designer and video editor working in Claude Code. Apply the **M09 Mask Swipe** 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

**Motion & Pace** — A geometric mask — a straight edge, split, circle or set of staggered bars — animates across the frame and reveals the next shot behind it, often with a thin accent line riding the edge. It is a clean, graphic transition that fits editorial and tech content, gives the viewer a clear direction of travel, and needs no special footage.

### M09 Mask Swipe

- **When:** ≈ 00:14.75 (0.50 s) (≈ derived — adjust to the nearest natural beat in the footage)
- **Layer / track:** V2+ (overlay above the picture)
- **What it does:** A hard-edged mask sweeps across the frame in one direction, wiping away the current shot to reveal the next one beneath it.
- **Parameters:** Mask shape: Straight edge; Direction: Left; Swipe length: 14 frames; Edge softness: 0%; Accent line on the edge: on; Accent colour: #D7FF5F; Easing: Expo out (snappy)
- **Steps:**
  1. At the cut 00:14.75, overlap the outgoing shot (top) and incoming shot (below) for 14 frames (467ms).
  2. Animate a straight-edged rectangle mask whose leading edge travels left across the full frame over those 14 frames using a fast expo-out curve (cubic-bezier(0.16, 1, 0.3, 1)); the mask removes the outgoing shot and reveals the incoming one.
  3. Remotion: drive clipPath (inset() for linear/split/bars, circle() for iris) with interpolate(frame, [0, 14], [0, 100]); FFmpeg: use xfade=transition=wipeleft:duration=0.47.
  4. Keep the mask edge crisp (no feather).
  5. Draw a 6px #D7FF5F line riding the mask's leading edge with a subtle glow; it appears with the mask and disappears on the final frame.
  6. Do not let the wipe edge cross the speaker's face mid-word; time it over a pause or start it after the sentence ends.
- **Assets:** Source video (⚠ MISSING) · optional: Second shot, B-roll footage
- **Fallback:** Mask swipes need no special assets. If the incoming shot is missing, wipe to a solid brand-colour card or the next sequence beat instead of an invented visual.

**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.