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Entry — Nepda Sale AI Ad Festival (Naver Plus Store)

Something Huge Is Coming

A broke student gets a sale alert, and a gift box the size of a skyscraper walks up to her dorm window.

People and scenes are AI-generated.

Length
25s
Format
9:16
Generated shots
7
Generate
Seedance 2.5 (Higgsfield)
Edit
Python, ffmpeg, OpenCV, Pillow
Date

In short

  • GenerateSeven shots with Seedance 2.5, one prompt per shot; continuing shots start from the previous shot's last frame
  • ColorMeasured each clip's green and purple in HSV and shifted them to the guide hues (140°, 258°)
  • CompositeGenerated the phone with a blank green screen, detected it every frame and warped the notification UI onto it
  • SoundEight sound effects synthesized in code and mixed over the clips' native audio; no stock audio
  • Exportffmpeg · 9:16 · 1080×1920 MP4

Pipeline

  1. GenerateSeedance 2.5 · a prompt per shot, last frame carried into the next
  2. CutPicked only the usable ranges; two 0.3 s dissolves
  3. ColorPer-clip HSV measurement → green 140°, purple 258°
  4. ScreenOpenCV finds the green screen → perspective-warped notification
  5. TypeBlack Han Sans · block labels with pop-in animation
  6. SoundNative clip audio + synthesized effects
  7. Export1080×1920 MP4 with ffmpeg

Prompts

Shot A — the phone buzzes, she looks upImage → video (desk frame from a test clip attached)
Use the attached photo as the first frame and keep the same woman, hoodie, desk and room. Vertical 9:16, 8 seconds, cinematic realism, night. Her plain black smartphone on the desk starts vibrating and its screen glows bright neon green, lighting her face from below. The desk lamp flickers, a pen rolls off the desk, the whole room trembles slightly with slow heavy footsteps outside. She slowly lifts her head and turns toward the window, eyes widening. Sound: phone buzzing on wood, then deep distant footsteps growing louder. No on-screen text, no letters, no logos, no brand names.
Shot A2 — phone screen close-upText → video (blank green screen, notification composited later)
Vertical 9:16, 6 seconds, night, cinematic realism. Extreme close-up, slightly high angle, of a plain black smartphone lying face-up on a wooden dorm desk next to textbooks and a pen, warm desk-lamp light. The phone buzzes and vibrates on the desk, then its whole screen lights up with one flat, solid, bright green color — a completely blank green screen with no icons, no text, no UI, no notifications. The green glow spreads over the desk. Slow push-in, phone stays in frame. Sound: phone vibrating on wood. No text, no letters, no logos.
Shot B — the giant box walks inText → video
Vertical 9:16, 8 seconds, blockbuster trailer, night, photoreal. A gift box as tall as a skyscraper, glossy neon green with a wide violet-purple ribbon and bow, walks on two short stubby legs between Seoul apartment towers, each step a gentle thud, glowing from inside, searchlights sweeping across it. People on balconies cheer and film with their phones, confetti drifting. Low angle from the street, slow push-in, volumetric light, joyful awe. Sound: deep soft footsteps, wind, a cheering crowd. No text, no letters, no logos.
Shot B2 — arriving at the windowImage → video (last frame of shot B attached)
Continue from the attached frame: the same skyscraper-sized neon green gift box with a violet ribbon. Vertical 9:16, 8 seconds. Seen from inside a small dorm room through the window: the giant box steps up to the building and slowly leans down toward the window until its glossy green surface and purple bow fill the view, its glow lighting the room. Curtains blow inward, a pen rolls off the desk. Sound: a huge soft thud, creaking ribbon, a rising hum. No text, no letters, no logos.
Shot C — the lid pops, comic burstImage → video (last frame of shot B2 attached)
Continue from the attached frame, same giant neon green gift box with violet ribbon right outside the window. Vertical 9:16, 8 seconds. The lid pops open and sharp comic-book starburst rays in neon green, violet purple, black and white burst toward the camera until they fill the whole frame, with bold halftone dots and speed lines. Fast, punchy pop-art energy, celebratory. Sound: a deep pop, then a bright rising whoosh. No text, no letters, no logos.
Shot D — morning, a hallway full of parcelsImage → video (frame of the same face attached)
Keep the same young Korean woman as in the attached photo (same face, hair, grey hoodie). Vertical 9:16, 8 seconds, morning, bright and warm. The camera is behind her, over her shoulder, inside her small dorm room. She faces the door with her back to the camera, grabs the handle and swings the door open: the hallway outside is filled wall-to-wall with neatly stacked glossy neon green parcels with violet-purple ribbons. She freezes for a moment, then turns her head back toward the camera, eyes wide, and laughs in disbelief. Sound: door creak, a cheerful chime, soft laugh. No text, no letters, no logos.

All sound effects are code

  • Footsteps · phone buzz · alert · rumble
  • Pop · riser · chime · impact
  • Mixed over the clips' native AI audio
  • No stock audio · no dialogue