Vertical Video Background & Scene Rebuild

Background & Scene Rebuild – Simple Explanation

This workflow lets you effortlessly change the background and rebuild entire scenes in any video. The process seamlessly integrates new environments into your footage while preserving original motion, timing, lighting, and performances.

How It Works (Step-by-Step)

1. Edit a Frame with Qwen (Image Editor)

Choose a key frame from your video and open it in Qwen.

Think of this step like “Photoshop for one frame”—you precisely modify only what you want to change in the scene.

3. Describe the New Background or Scene in Your Prompt

Type a detailed prompt describing the new environment, for example:

• “Neon cyberpunk street at night”

• “Luxury penthouse with city skyline”

• “Rainy alley with cinematic lighting”

Qwen edits the frame and rebuilds the scene with correct lighting, depth, and perspective.

4. Send the Edited Frame to Wan 2.1 FunControl

Wan 2.1 FunControl analyzes:

• Your edited frame

• Your original video

It detects the exact position, depth, and structure of the rebuilt scene, then locks it to the original camera movement.

This allows the new background to:

• Move naturally with the camera

• Match real lighting changes

• Maintain correct depth and perspective

5. Upload Your Original Video

Wan uses your original video’s motion, lighting, and camera movement to perfectly synchronize the rebuilt background with the live subject.

Your performance, gestures, and motion remain completely real and untouched.

6. Activate Wan 2.1 FunControl

The system regenerates the entire video frame-by-frame, replacing only the background while keeping:

• Original motion

• Original acting

• Original camera behavior

The new scene looks like it was filmed in-camera.

7. Reactor Face / Character Fix

A Reactor workflow is applied to:

• Fix face consistency

• Restore original facial structure

• Match expressions to the real performance

• Correct any AI deformation on the character

This ensures the character looks 100% like the original person in the source video.

8. Final Upscaling

The completed video is now upscaled using an advanced upscaler.

This:

• Restores sharpness and fine details

• Removes AI artifacts

• Brings everything into clean Full HD or higher resolution

Both the subject and the rebuilt background match perfectly in quality.

9. Download Your Final Video

Export a finished MP4 where:

• The background feels naturally filmed

• The subject remains unchanged

• Motion, lighting, and realism stay intact

It looks like a real scene captured in-camera.

Behind the Scenes (In Simple Terms)

• You change the background on one key frame

• Wan 2.1 animates and rebuilds that change across the whole video

• The Reactor module fixes the face and character identity

• Upscaling polishes everything to cinematic quality

Final Result

A flawless, cinematic video with a fully rebuilt background and scene, perfectly synced with your original performance.