extend_video generates additional footage that continues from where an existing video ends — not a slow-motion stretch of the same frames, but genuinely new AI-generated continuation that follows on from the last moment of the source clip.
This is the tool for a clip that's a few seconds too short for the cut you need, or for pushing a generated shot further than the model's native output length.
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Extend/continue an existing video — generates additional footage that seamlessly continues from where the original video ends. Use when the user wants to make a video longer, continue a scene, or add more content to an existing video.
What to tell the agent
Versely's agent maps this plain-English request directly onto extend_video. You don't need to know the parameter names — just describe what you want.
“Extend this video by another 5 seconds, continuing the same camera motion and scene.”
How it works
1. Supply the source clip
video_url points to the video you want to continue.
2. Describe the continuation
prompt tells the model what should happen next — keep it consistent with the existing motion and scene for a seamless join.
3. Pick a model and duration
model and duration control which engine generates the continuation and how much extra footage you get.
4. Review the seam
Check the transition point between the original footage and the generated continuation before using it — AI extensions aren't always a perfectly invisible join.
Models & real cost
Real extend-video models include LTX 2.3 Extend Video (10 credits per second of output) and Grok Imagine Extend (8 credits) — pricing and available models vary, so confirm the current option with estimate_cost before generating.
The formula behind that number: What does a 30-second AI talking head cost? — bills a flat rate for every second of output, so length is the only lever.
Limits & things to know
- The continuation is AI-generated, not a genuine continuation of the original camera roll — motion, lighting and detail can drift from the source, especially for longer extensions.
- Quality depends heavily on the model chosen and how well the prompt matches the existing footage's style and motion.
- This adds NEW generated content after the clip ends — it isn't a slow-motion stretch of existing frames.
Who uses this
- Pushing a generated video clip past its model's native max length
- Covering a voiceover or music cue that runs a few seconds longer than the video
- Extending a hero shot for a longer cutdown
Frequently asked questions
Does this just slow down or loop my existing footage?+
No — extend_video generates genuinely new AI footage that continues the scene, rather than stretching or looping the frames you already have.
What models can extend a video?+
Real options include Runway Video Extend (18 credits) and Grok Imagine Extend (8 credits) — check current availability and pricing before generating.
Will the extension look seamless?+
It usually blends well for short extensions with a well-matched prompt, but it's AI-generated continuation, not real camera footage — always review the join before publishing.
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Extend a Video's Length inside Versely
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