seedance-promptinglisted

# Seedance prompting and cost control Seedance's distinguishing features are **reference-to-video with up to 50 references**, **native lip-synced dialogue in 10+ languages**, **video editing and extension**, and **4–30s in a single pass**. Its distinguishing risk is that it bills **per second generated, rejects included** — so the prompt discipline here is inseparable from the cost discipline. Full numbers, sources and worked budgets: [`docs/seedance-cost-model.md`](../../docs/seedance-cost-model.md). --- ## 1. Know what you are buying before you prompt **Seedance is not free on any API route.** "Free Seedance" headlines refer to consumer web UIs (watermarked exports) or time-boxed promos. Capabilities of Seedance 2.5, from the vendor model page: - **Resolution: 480p and 720p only.** No 1080p, no 4K. (Seedance **2.0** does 1080p/4K but caps at 15s.) 720p max means an upscale step before Instagram, which prefers 1080×1920. - 24 fps · **4–30s** in a single pass, no stitching · `.mp4` / `.mov` - Inputs: text, image, video, audio → video. Up to **50 references** (30 images + 10 videos + 10 audio), cited in the prompt as `@Image1`, `@Video1`, `@Audio1`. - Task types: multimodality-to-video, **reference-to-video**, **video editing** (e.g. *"remove everyone in @Video1 except the protagonist"*), **video extension**, first-frame / first-and-last-frame image-to-video, text-to-video. - Native synchronised audio and **lip-sync dialogue in 10+ languages**. - Individual (n