Introducing ByteDance Seedance V1.5 Pro Video Extend on WaveSpeedAI
ByteDance Seedance V1.5 Pro Video Extend Is Now Live on WaveSpeedAI
The next evolution of AI video generation has arrived. WaveSpeedAI is excited to announce the availability of ByteDance Seedance V1.5 Pro Video Extend—a powerful video extension model that transforms short clips into longer, seamlessly continuous footage while preserving motion, identity, and scene coherence.
Built by ByteDance’s acclaimed Seed team, the same researchers behind the top-ranked video generation models on industry benchmarks, Seedance V1.5 Pro Video Extend represents a significant leap forward for creators, marketers, and production teams who need to extend video content without sacrificing quality.
What Is Seedance V1.5 Pro Video Extend?
Seedance V1.5 Pro Video Extend is a specialized video-to-video model designed to intelligently extend existing video clips. Unlike simple looping or frame interpolation, this model analyzes your source video’s motion patterns, subject characteristics, and scene composition to generate genuinely new footage that flows naturally from the original.
The model is powered by ByteDance’s innovative Dual-Branch Diffusion Transformer (DB-DiT) architecture with 4.5 billion parameters. This architecture uses two parallel transformer branches that denoise video and audio tokens simultaneously, while a cross-modal joint module exchanges timing and semantic information between streams. The result is extensions that maintain perfect synchronization between visual motion and optional audio generation.
What sets Seedance apart is its “native” approach to joint generation, where audio and visual streams are deeply intertwined from the very beginning of the diffusion process. When a footstep appears visually, the corresponding sound isn’t just placed near the right time—it’s generated with the visual of the foot hitting the ground, creating unprecedented synchronization.
Key Features
Natural Motion Continuation The model extends movement with consistent pacing and visual logic, ensuring smooth transitions from your source footage to generated content. Whether your subject is walking, gesturing, or performing complex actions, the extension maintains the same rhythm and energy.
Scene Coherence Preservation Lighting, framing, color grading, and subject consistency remain stable across the extension. Background elements, clothing details, and facial features stay locked in, preventing the visual drift that plagues many extension tools.
Prompt-Guided Direction Guide the extension with natural language prompts. Describe what should happen next, specify camera behavior, and set constraints—all without rebuilding the scene from scratch. For example: “Continue the scene with the subject holding the glowing ball, the light intensifies near the end, keep the same camera angle and lighting style.”
Flexible Duration Control Generate extensions from 4 to 12 seconds with precise control. Start with shorter extensions to validate motion and framing before committing to longer output.
Resolution Options Choose between 480p and 720p output with built-in upscaling, allowing you to balance quality requirements with budget considerations.
Optional Audio Generation Enable or disable audio generation based on your workflow. When enabled, the model creates synchronized sound that matches the visual content—a feature made possible by the dual-branch architecture.
Seed-Reproducible Results Lock in a fixed seed value for reproducible results. This allows you to iterate on prompt variations while maintaining consistent base output, essential for professional production workflows.
Practical Use Cases
Advertising and Marketing Turn short hero shots into longer deliverables without additional filming. A 3-second product reveal can become a 12-second sequence perfect for different ad placements, from social feeds to pre-roll.
Short-Form Content Creation Extend key moments in TikTok, Reels, or Shorts content. When you capture the perfect reaction or moment but need more runtime, Video Extend delivers natural continuation without reshooting.
Short Drama and Narrative Production Maintain character identity and scene continuity across extended sequences. The model’s ability to preserve clothing, face, and style consistency enables coherent mini-drama production from limited source footage.
Trailer and Promo Creation Stretch impactful scenes to fit precise timing requirements. When you need exactly 8 seconds of a particular shot but only captured 4, Video Extend bridges the gap with production-quality output.
Social Media Variations Generate multiple longer cuts from a single base clip. Create platform-specific versions optimized for different aspect ratios and duration requirements without duplicating production effort.
Getting Started on WaveSpeedAI
Getting started with Seedance V1.5 Pro Video Extend on WaveSpeedAI takes just minutes:
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Access the Model: Navigate to Seedance V1.5 Pro Video Extend on WaveSpeedAI.
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Upload Your Video: Provide a clean source video—clear subjects, stable exposure, and minimal compression artifacts produce the best results.
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Write Your Extension Prompt: Describe what happens next. Be specific about action, motion intensity, and camera behavior. Include constraints like “keep the same character, outfit, lighting, framing” to maintain consistency.
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Configure Settings: Set your desired duration (4-12 seconds), resolution (480p or 720p), and whether to generate audio.
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Generate: Submit and receive your extended video within seconds.
Pricing
WaveSpeedAI offers transparent, predictable pricing based on resolution and audio generation:
| Resolution | With Audio (per second) | Without Audio (per second) |
|---|---|---|
| 720p | $0.052 | $0.026 |
| 480p | $0.024 | $0.012 |
A typical 10-second 720p extension with audio costs just $0.52—a fraction of traditional production costs.
Why WaveSpeedAI?
WaveSpeedAI provides the optimal platform for running Seedance V1.5 Pro Video Extend:
No Cold Starts: Immediate processing without waiting for model initialization. Your requests begin generating instantly.
Fast Inference: Optimized infrastructure delivers results quickly, powered by knowledge distillation and pipeline parallelism that accelerate inference by over 10x compared to baseline implementations.
Affordable Pricing: Pay only for what you use with transparent per-second pricing. No subscriptions, no hidden fees.
Production-Ready API: Integrate directly into your workflows via REST API. Automate video extension at scale with predictable costs and reliable output.
Extend Your Creative Possibilities
Seedance V1.5 Pro Video Extend removes the constraints of fixed-duration source footage. Whether you’re a solo creator extending social clips or a production team scaling commercial content, this model delivers professional-quality video extension with the precision and consistency your projects demand.
The same technology that topped both text-to-video and image-to-video benchmarks is now available to extend your existing footage—accessible through WaveSpeedAI’s fast, affordable, and reliable infrastructure.
Ready to extend your videos? Try Seedance V1.5 Pro Video Extend on WaveSpeedAI and experience the future of AI video generation today.
