Bytedance Seedance V1.5 Pro Video Extend

Bytedance Seedance V1.5 Pro Video Extend

Playground

Seedance 1.5 Pro Video-Extend turns short video clips into longer videos with natural motion continuation, stable aesthetics, and upscaled output. It supports 4–12s duration control, multiple aspect ratios/resolutions, and seed-reproducible results—ideal for extending ad creatives and short-drama shots. Built for stable production use with a ready-to-use REST API, no cold starts, and predictable pricing.

Features

ByteDance 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

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)

Reference pricing (generate_audio = false)

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.

# Submit the task
curl --location --request POST "https://api.wavespeed.ai/api/v3/bytedance/seedance-v1.5-pro/video-extend" \
--header "Content-Type: application/json" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}" \
--data-raw '{
    "duration": 5,
    "resolution": "720p",
    "generate_audio": true,
    "camera_fixed": false,
    "seed": -1
}'

# Get the result
curl --location --request GET "https://api.wavespeed.ai/api/v3/predictions/${requestId}/result" \
--header "Authorization: Bearer ${WAVESPEED_API_KEY}"