Seedance 1.5 Pro Text to Video

bytedance/seedance-1.5-pro-t2v

Seedance 1.5 Pro (T2V) is ByteDance Seed’s production-oriented text-to-video model built for cinematic realism, strong prompt adherence, and high expressive motion. It is designed for ad creatives and short-drama workflows where aesthetic stability, emotion-rich acting, and controllable duration matter.

Key Features

• High-quality prompt alignment
  Accurately follows detailed scene descriptions, shot instructions, and emotional tone, producing coherent clips with stable subject and scene intent.

• Expressive motion and emotion
  Natural motion amplitude and strong rhythm; fine-grained facial expressions and emotional delivery, suitable for drama-like performances and high-impact ads.

• Strong aesthetics with live-action realism
  A “natural, live-action” leaning look with stable lighting, composition, and color harmony for premium-looking outputs.

• Rich effects via prompting
  The base model supports a wide variety of visual effects achievable directly through prompting, enabling template-like creative effects without extra tooling.

• Flexible duration control (4–12 seconds)
  Specify any integer duration from 4s to 12s. Supports Smart Duration (-1) where the model selects an appropriate length within the same range.

• Aspect ratio control
  Choose either adaptive (model selects the best ratio from the prompt) or explicitly set one of:
  16:9, 9:16, 4:3, 3:4, 1:1, 21:9.

Parameters

• prompt (required)
  Text description of the scene, style, subject actions, camera motion, and overall mood.

• duration
  Integer seconds in [4, 12]. Use -1 for Smart Duration (model decides within [4, 12]).

• resolution
  One of 480p, 720p.

• fps
  Fixed at 24.

• ratio
  Use adaptive (model selects a suitable ratio) or set one of: 16:9, 9:16, 4:3, 3:4, 1:1, 21:9.

• fixed_camera
  Boolean. If true, the camera remains fixed; if false, camera motion is driven by the prompt.

• seed
  Integer. Controls randomness; the same seed tends to produce more similar outputs. Set -1 to cancel random seed.

Use Cases

• Performance-heavy ad creatives: emotion-forward acting beats with stable visual quality.
• Live-action style short drama clips: realistic lighting/composition and coherent storytelling moments.
• Template-like VFX content: prompt-driven effects for fast experimentation and iteration.

Notes

• For the cleanest motion, keep prompts specific but not overloaded: limit the number of primary subjects and simultaneous actions, especially in short clips.
• If you see shaky composition or drifting framing, set camera_fixed = true and describe motion using subject movement rather than camera movement.
• When using duration = -1, write prompts with a clear narrative “end beat” (a natural stopping point) so the model has a reason to conclude.

Related Models

• ByteDance Seedance V1 Pro Fast (Text-to-Video) – Faster Seedance variant for quick iterations and previews.
• ByteDance Seedance V1 Pro (T2V 480p) – A lower-res option for budget-friendly testing and rapid prompt iteration.
• WaveSpeedAI HunyuanVideo-1.5 (Text-to-Video) – Lightweight T2V model with strong motion coherence and efficient inference.
• WaveSpeedAI HunyuanVideo (T2V) – Another T2V option for broader experimentation across styles and pacing.