Seedance 1.5 Pro — Native Audio-Video Generation

Seedance 1.5 Pro is ByteDance's AI video generation model released on December 16, 2025. It was the first model in the industry to generate audio and video natively in a single pass — meaning dialogue, sound effects, ambient audio, and music are all produced simultaneously with the visuals, not added afterward. It outputs up to 1080p video at 24fps with millisecond-accurate lip-sync across multiple languages and dialects.

The single biggest difference is audio. Seedance 1.0 produced silent video only. Seedance 1.5 Pro introduced native audio-video joint generation — the model generates dialogue, sound effects, ambient audio, and music in the same diffusion pass as the visuals. It also added millisecond-precise lip-sync across multiple languages and dialects, improved cinematic camera control with autonomous scheduling, and enhanced character consistency with more expressive facial micro-expressions and emotional depth.

Seedance 1.5 Pro supports lip-sync across multiple languages and regional dialects including English, Mandarin Chinese, Japanese, Korean, Spanish, Portuguese, Indonesian, Cantonese, and Sichuanese. The model captures unique vocal prosody and emotional nuance for each language, with lip movements aligned to speech at millisecond accuracy — no post-production dubbing required.

Seedance 1.5 Pro outputs up to 1080p resolution at 24fps. Video duration ranges from 4 to 12 seconds per generation. Supported aspect ratios include 16:9, 9:16, 1:1, 4:3, and 21:9, covering landscape, portrait, square, and widescreen formats.

Seedance 1.5 Pro accepts text prompts and optionally a single reference image for guided generation. Text prompts can include detailed visual descriptions, camera movement instructions, dialogue lines, and audio descriptions — all interpreted and synthesized in a single unified generation pass. Multi-image and multi-video input capabilities were introduced in Seedance 2.0.

Seedance 1.5 Pro uses a Multimodal Diffusion Transformer (MMDiT) architecture with a cross-modal joint synchronization module. The model integrates dual branches — one for video, one for audio — that run in parallel and are coupled via the cross-modal module. This unified architecture enables true simultaneous generation rather than sequential audio dubbing. The result is audio that is physically and temporally synchronized with the visuals from the first frame.

Seedance 1.5 Pro understands professional camera terminology in plain language. You can describe pan, tilt, zoom, truck, tracking shots, dolly zooms, orbital moves, and continuous long takes directly in your prompt. The model executes these accurately without requiring special syntax or keyframe input.

Seedance 1.5 Pro pioneered native audio-video joint generation and was the first model to achieve this breakthrough. Seedance 2.0 builds on that foundation with enhanced capabilities: 2K resolution (vs 1080p), four input modalities (text, image, video, and audio — vs text and image only), cross-shot character consistency for seamless multi-shot narratives, reference video control for precise motion recreation, beat-sync audio editing, and support for up to 12 reference files in a single generation.

Yes. Videos generated with Seedance 1.5 Pro on Vofy can be used for commercial purposes including advertising, social media marketing, product showcases, professional production, and client work. Check the Vofy terms of service for full licensing details and usage rights.

A standard Seedance 1.5 Pro generation takes roughly 60 seconds. The model uses an inference acceleration framework that maintains over 10× speed improvement compared to a naive implementation, keeping generation times practical for iterative workflows.