Timelapse Creator

Template

[ANCHOR — identical for all frames]
Interior of a workshop, [object] centered in frame, shot from 
[angle] at [distance]. [Lighting description]. Same setup throughout.

[VARIABLE — unique per frame]  
Frame 1: The [object] shows [damaged state description]...
Frame 2: The [object] has been [intermediate state]...
Frame 3: The [object] is being [process description]...
Frame 4: The [object] is [final state description]...

Phase 3: Approval

Send all keyframes to user. Check:

• Consistency (same scene, same angle?)
• Logical progression (does transformation make sense?)
• Quality (any artifacts, weird details?)

If approved → Phase 4. If not → regenerate specific frames.

Phase 4: Video (Veo 3.1-fl)

Rules

1. First image = START frame, second = END frame
2. Use base64 encoding (no need for public URL hosting)
3. Generate pairs: frame1→frame2, frame2→frame3, frame3→frame4
4. Prompt describes the PROCESS of transformation
5. Model: veo-3.1-fast-fl for tests, veo-3.1-fl for final

Video Prompt Template

Smooth realistic timelapse of [process description]. Fixed camera angle, 
no camera movement. Continuous physical transformation, realistic lighting 
changes. No dissolves, no crossfades — only physical build-up and assembly.

Request Format (Sync API)

{
  "messages": [{"role": "user", "content": [
    {"type": "text", "text": "Smooth timelapse transition..."},
    {"type": "image_url", "image_url": {"url": "data:image/jpeg;base64,{START}"}},
    {"type": "image_url", "image_url": {"url": "data:image/jpeg;base64,{END}"}}
  ]}],
  "model": "veo-3.1-fast-fl",
  "stream": true
}

Phase 5: Delivery

1. Save all mp4 clips to content/videos/{project-name}/
2. Send to client
3. Client assembles in CapCut (speeds up 8s→2-3s per segment)

Cost Summary

Transition Prompt Templates

Time of Day

Smooth transition from day to night, realistic lighting changes,
maintaining the same camera angle and composition

Construction/Growth

Timelapse showing gradual construction progress,
realistic materials appearing, smooth continuous motion

Nature Changes

Natural progression showing seasonal change,
realistic weather transition, maintaining landscape composition

Space Transformation

Smooth transformation of the space,
realistic material changes, maintaining perspective and scale

Troubleshooting

Video Output Specs

Output Structure

content/timelapse/{project-name}/
├── frames/
│   ├── frame-1.jpg
│   ├── frame-2.jpg
│   ├── frame-3.jpg
│   └── frame-4.jpg
├── videos/
│   ├── segment-1-2.mp4
│   ├── segment-2-3.mp4
│   └── segment-3-4.mp4
├── prompts.md
└── notes.md

Timelapse Creator v1.0 — Content Factory