Seedance 1.5 Pro Video Extend

Seedance V1.5 Pro — Video Extend

Seedance V1.5 Pro (Video Extend) extends an existing video into a longer clip while preserving motion continuity, subject identity, and scene coherence. Use a prompt to guide what happens next, set duration and resolution, and optionally enable audio generation for the extended segment.

Why it stands out

• Smooth continuation that matches the original clip’s rhythm and aesthetics
• Prompt-guided extension to steer action, mood, and camera behavior
• Resolution options with transparent multipliers (480p / 720p)
• Optional audio generation with clear pricing impact

Key Capabilities

• Natural motion continuation Extends movement with consistent pacing and visual logic.

• Scene coherence preservation Maintains lighting, framing, and subject consistency across the extension.

• Prompt-guided direction Describe the next action and constraints without rebuilding the scene.

• Optional audio generation Enable or disable audio generation depending on your workflow needs.

Parametrs

Parameter	Description
video*	Input video (public URL or uploaded file reference, depending on client).
prompt*	Describe what should happen next and what must remain consistent.
duration	Output duration in seconds (commonly used values: 4–12s; exact allowed values depend on endpoint validation).
resolution	Output resolution: 720p or 480p.
generate_audio	Whether to generate audio for the output video (true/false).
camera_fixed	Whether to fix the camera position (true/false).
seed	Random seed (-1 for random; set a fixed integer for reproducible results).

Prompt Tips

Write prompts like a continuation brief:

• Describe what happens next (action + timing)
• Add motion intensity (subtle / smooth / dynamic)
• Specify camera behavior if needed (fixed / slow pan / gentle zoom)
• Add constraints: “keep the same character, outfit, lighting, framing”

Example prompts:

• Continue the scene with the subject holding the glowing ball, the light intensifies near the end, keep the same camera angle and lighting style.
• Extend with subtle hand movement and a slow push-in, keep the subject centered and the environment unchanged.

Pricing

Reference pricing (generate_audio = true)

Resolution	Price per second	Example (5s)	Example (10s)
720p	$0.052	$0.26	$0.52
480p	$0.024	$0.12	$0.24

Reference pricing (generate_audio = false)

Resolution	Price per second	Example (5s)	Example (10s)
720p	$0.026	$0.13	$0.26
480p	$0.012	$0.06	$0.12

Best Practices

• Use clean input videos (clear subject, stable exposure, minimal compression artifacts).
• Keep prompts specific but short, and explicitly state what must stay the same.
• Start with 5 seconds to validate motion and framing before extending longer.
• Use a fixed seed when iterating to compare small prompt changes.

Use Cases

• Ad creative extension (turn short shots into longer deliverables)
• Social content variations (longer cuts from a base clip)
• Storytelling continuity (extend key moments with controlled motion)
• Marketing edits (extend hero scenes with stable aesthetics)

Notes

• The input video must be accessible to the runtime (public URL or valid uploaded reference).
• If motion drifts or the scene changes too much, add stronger constraints: “keep camera fixed”, “same outfit and lighting”, “do not change background”.
• Supported durations and modes can vary by deployment; rely on the endpoint UI/validator for exact allowed values.

Related Models

• Seedance V1.5 Pro Video Extend Fast — Faster processing with higher-resolution options for rapid iteration and production outputs.
• Seedance V1.5 Pro (Text-to-Video) — Generate new videos from text prompts for end-to-end creation.
• Seedance V1.5 Pro (Image-to-Video) — Animate still images into videos with guided motion and stable aesthetics.