Seedance 1.5 Pro
A frontier video generation model developed by ByteDance: generates video with synchronized dialogue, sound effects, and music in a single pass.
TL;DR
An excellent video model to generate audio and video simultaneously, no post-production sync needed.
Creates perfectly lip-synced dialogue, natural foley, and ambient sound alongside cinematic video. Best for short-form drama, ad spots with voice-over, and any content requiring built-in narration or dialogue across 8+ languages.
Strengths for marketers
Native audio-video generation: Dialogue, sound effects, and ambient audio created alongside video: lip movements stay locked to speech, foley stays locked to action.
Multilingual lip-sync: Accurate synchronization across English, Spanish, Portuguese, Japanese, Korean, Mandarin, Cantonese, and Indonesian.
Cinematic camera control: Full camera grammar: pan, tilt, zoom, dolly, orbit, tracking shots—described directly in your prompt.
Character consistency: Faces, clothing, and expressions stay stable across the clip even when camera angle changes.
Ideal use cases
Product demos with narration and spatial audio
Talking-head content with accurate lip-sync
Short-form dialogue for TikTok, Reels, or YouTube Shorts
Ad spots with synchronized voice-over and ambient sound
Social teasers and trailers with integrated sound design
Multilingual campaigns without reshoots or redubbing
Weaknesses
Limited to Chinese and English voice output (other languages auto-translate to English for voice)
Resolution limited to 720p
12-second maximum duration
How to use effectively
Principles
Write your prompt like a shot description on a call sheet. Include scene, action, dialogue, camera movement, and audio/foley cues.
Prompt structure
Scene: "Modern minimalist kitchen, morning light streaming through large windows"
Action: "A woman picks up the coffee mug and takes a sip, smiling with satisfaction"
Dialogue: Use quotes —
"This is exactly how I wanted to start my day."Camera: "Slow push-in from medium shot to close-up on her face"
Audio/Foley: "Coffee machine hum fading, soft morning ambience, ceramic clink"
Be specific about camera behavior ("locked tripod," "handheld with subtle shake," "smooth orbit right") and include ambient sound cues for best results.
Model parameters
Inputs accepted
Text (text-to-video)
Text + 1 Reference Image (image-to-video, starting frame)
Text + 2 Reference Images (start frame + end frame)
Output characteristics
Default Resolution: 720p (480p available for faster iteration)
Duration options: 4–12 seconds (default: 5s)
Available Aspect Ratios: 21:9, 16:9, 4:3, 1:1, 3:4, 9:16
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