Seedance v1.5 Pro Image-to-Video Fast API by ByteDance

Seedance 1.5 PRO: A Native Audio-Visual Joint Generation Foundation Model

Seedance 1.5 PRO is a foundational model engineered specifically for native joint audio-visual generation, developed by the ByteDance Seed team. It represents a significant leap forward in transforming video generation into a practical, utility-driven tool. By integrating a dual-branch Diffusion Transformer architecture, the model achieves exceptional audio-visual synchronization and superior generation quality, establishing it as a robust engine for professional-grade content creation.

Key Features

Seedance 1.5 PRO introduces several key technical advancements that set a new standard for audio-visual content generation.

• Unified Multimodal Generation : Leverages a unified framework based on the MMDiT architecture to facilitate deep cross-modal interaction, ensuring precise temporal synchronization and semantic consistency between visual and auditory streams.
• Precise Audio-Visual Sync : Achieves high-fidelity alignment of lip movements, intonation, and performance rhythm. It natively supports multiple languages and regional dialects, accurately capturing unique vocal prosody and emotional tonalities.
• Cinematic Camera Control : Possesses autonomous camera scheduling capabilities, enabling the execution of complex movements such as continuous long takes and dolly zooms ("Hitchcock zoom"), significantly enhancing the dynamic tension of the video.
• Enhanced Narrative Coherence : Through strengthened semantic understanding, the model significantly improves the overall narrative coordination of audio-visual segments, providing strong support for professional-grade content creation.
• Efficient Inference Acceleration : An optimized multi-stage distillation framework, combined with quantization and parallelization, boosts the end-to-end inference speed by over 10x while preserving high performance.

Performance Highlights

The model's capabilities were rigorously evaluated against other state-of-the-art video generation models using the comprehensive SeedVideoBench 1.5 framework. Seedance 1.5 PRO demonstrates significant improvements across both video and audio dimensions.

In Text-to-Video (T2V) and Image-to-Video (I2V) tasks, it achieves a leading position in motion quality and instruction following (alignment). The model also shows strong competitiveness in visual aesthetics and motion dynamics. For audio generation, particularly in Chinese-language contexts, Seedance 1.5 PRO consistently outperforms competitors like Veo 3.1, delivering superior audio quality and audio-visual synchronization.

Use Cases

Seedance 1.5 PRO is well-suited for a wide range of professional applications, including:

• Film and Short Drama Production: Creating high-quality, emotionally resonant scenes with precise character performances.
• Advertising and Social Media: Generating engaging and dynamic video content for marketing campaigns.
• Cultural and Artistic Expression: Faithfully rendering traditional performing arts, such as Chinese opera, by capturing distinctive cadences and stylized gestures.
• Multi-Lingual Content: Producing content in various languages and dialects with accurate lip-sync and intonation.