Seedance 1.5 Pro — Lip-Sync AI Video in 8+ Languages

Describe a scene and receive a video with motion, camera work, and optionally synchronized dialogue or sound effects. Prompts support detailed multi-part instructions with emotional tone and environmental context.

Upload a photo or illustration and the model infers natural motion — hair movement, fabric sway, body gestures — while preserving fine details from the source image including skin texture, accessories, and background elements.

Audio is generated in the same inference pass as video through a Dual-Branch Diffusion Transformer. The output includes layered sound: spoken dialogue with lip-sync, context-aware foley effects, and environmental ambience, mixed and balanced automatically.

Speaking characters exhibit mouth-shape accuracy at the phoneme level across 8+ languages. Unlike post-production dubbing, the lip movements are generated simultaneously with the audio, producing natural alignment without manual adjustment.

Choose 480p for fast drafts, 720p for the standard quality-to-cost ratio, or 1080p for final output. Credits scale with pixel count — a 480p video costs roughly a quarter of a 1080p video at the same duration.

Set any duration between 4 and 12 seconds. Unlike models that only offer fixed 5s or 10s lengths, 1.5 Pro gives per-second control — pay only for the length you need.

16:9, 9:16, 1:1, 4:3, 3:4, and 21:9. The 21:9 ultrawide option is uncommon among AI video generators and suits widescreen and film trailer formats.

Lock the camera to a fixed position for product demos, interview framing, or any shot where camera movement would be distracting. When unlocked, the model generates natural camera motion based on scene content.

Pass a seed value to reproduce the same output across generations. Useful for A/B testing different prompts while keeping visual style consistent.

Provide both a starting image and an ending image to define the first and last frames. The model interpolates between them, enabling controlled transitions and predictable story arcs.