Extend a Short Clip

A ~5s clip → a longer, seamlessly continued video.

Category: edit · Difficulty: Intermediate · ~Time: 5 min

What you'll make

Take a short generated or filmed clip and extend it forward in time so the motion, subject, and style continue without a visible seam. Use it to turn a 5-second draft into something long enough for a social post, or to add breathing room before a cut.

Models used

🎬 Video — Wan (video-extend) (resolve live; e.g. alibaba/wan-2.5/video-extend)
🎬 Video (alt) — Kling 3 (i2v from last frame) (resolve live; e.g. kwaivgi/kling-v3.0-pro/image-to-video)
💬 LLM — Claude (to describe how the action should continue), optional

Steps

Upload the source clip — "Upload this local video and return the URL." → maps to atlas_upload_media; keep the download_url.
Describe the continuation — say what happens next and that motion/style must stay continuous. Keep the camera and pacing consistent with the source.
Extend — "Continue this clip for another few seconds, keeping the same subject, motion, and style." → maps to atlas_generate_video with Wan (video-extend), passing the uploaded clip URL.

Tip: ask the agent to atlas_search_docs for the video-extend model first — the input-video field, max added duration, and resolution constraints are model-specific, so pull the live schema.
Poll & stitch — the agent submits then polls via atlas_get_prediction until the extended clip is ready; chain another extend pass on the new tail for longer runs.

Prompt starters

Continue this clip seamlessly: the camera keeps its slow dolly-in, the subject
keeps walking forward at the same pace, same lighting and color grade. No cut.

Extend the shot — the waves keep rolling in and the sun sinks slightly lower.
Maintain the existing motion direction, speed, and cinematic color.

Tips & variations

No native extend for your clip? Fall back to Kling 3 (i2v): extract the last frame and animate it forward, then concatenate — have the agent atlas_search_docs for the live i2v schema.
Each extension can drift slightly; keep the continuation prompt tight ("same subject, same motion, no cut") and stop after 1–2 passes for best coherence.
Match the source's resolution and aspect ratio in the request so the seam is invisible.