Video Extend takes an existing video clip and uses AI to generate a natural continuation, making it longer while preserving the original style, motion, and visual character. This is useful when a generated clip ends too soon, or when you want to add more time to footage before editing.Documentation Index
Fetch the complete documentation index at: https://docs.artnex.app/llms.txt
Use this file to discover all available pages before exploring further.
Navigate to Video Extend
Go to Tools > Video > Video Extend in the Artnex sidebar.How to extend a video
Upload your video
In the prompt bar at the bottom of the page, click the video upload area (the dashed rectangle on the left) and select a video file from your device. Accepted formats include MP4, MOV, and WebM.
The video uploader accepts any common video format. Once uploaded, a thumbnail preview appears in the upload area. Click the × button to remove it and start over.
Write a continuation prompt
In the text area, describe how the video should continue. Be specific about the action, camera movement, or any changes you want in the extended portion. For example: “The character continues walking forward as the camera follows from behind.”
Choose a quality tier
Use the model selector in the control bar to choose between:
- Fast — outputs at 720p or 1080p, faster processing
- Standard — outputs at 480p or 720p, slower but available for different use cases
Set the resolution
Use the resolution dropdown to choose your output resolution. Available options depend on the selected quality tier:
| Quality tier | Available resolutions | Credit cost |
|---|---|---|
| Fast — 720p | 720p | 2,000 credits |
| Fast — 1080p | 1080p | 2,000 credits |
| Standard | 480p, 720p | 2,600 credits |
The credit cost displayed in the interface reflects the selected model. The cost is shown in the control bar next to the Extend button before you confirm.
Adjust advanced settings (optional)
Click Settings to access additional controls:
- Duration — set the length of the extension from 4 to 12 seconds (slider)
- Generate Audio — enable AI-generated audio for the extended portion
- Camera Fixed — lock the camera position to reduce unwanted movement
- Seed — enter a seed value to reproduce the same result across multiple runs
Extend the video
Click Extend to start generation. Processing time varies based on the length and resolution you selected.
Credit costs
| Resolution | Credits per generation |
|---|---|
| 720p (Fast) | 2,000 credits |
| 1080p (Fast) | 2,000 credits |
| Standard (480p / 720p) | 2,600 credits |