seedance-2-0

What it does

Direct Seedance 2.0 production acts as a provider- and model-family-specific operating guide for creating 4–15 second shots with synchronized media (image, video, audio) and multimodal references. It instructs users to establish the exact gateway contract before writing a request and to select among BytePlus ModelArk variants (Seedance 2.0, Seedance 2.0 Fast, Seedance 2.0 Mini) according to quality, latency, and cost needs. It emphasizes using official endpoints, top-level JSON payloads, and specific media roles (first_frame, reference_image, reference_video, reference_audio) when building content.

How it works

The guide prescribes: establish gateway contracts and use the official APIs and model IDs for Seedance 2.0 family; choose the appropriate modelArk ID from a documented table; construct a direct ModelArk request envelope with fields like model, content, resolution, ratio, duration, generate_audio, watermark, return_last_frame, callback_url, execution_expires_after, safety_identifier, and priority. It requires using ordered text/image/video/audio items with roles to define first/last/reference behavior, validates media via ffprobe-like checks, and assigns one job per reference using an asset ledger. It details how to write prompts as executable direction, with steps for defining subjects, binding references, describing settings, actions, and camera moves, and outlines mode-specific directions for text-to-video, first/last frame, multimodal reference, video editing, and extension tasks. It provides example payload structures for the content array and strict guidance for media validation and asset management.

When to use it

Use when the shot benefits from synchronized generation across media types, needs reference materials for subject/style/layout, or requires a short, self-contained sequence (4–15 seconds) with first-frame or first-and-last-frame transitions, or a multimodal edit where an element from one asset modifies another source video. It also governs decisions about model Ark variants and gateway endpoints before prompting.

What it can touch

Touchpoints include: BytePlus ModelArk endpoints for creation and retrieval, model IDs such as dreamina-seedance-2-0-260128 and fast/mini variants, and gateway contracts (BytePlus ModelArk, fal, Replicate) with their respective endpoint patterns and response structures. It instructs constructing the content[] payload and media validation steps before submission.

Caveats

Notes include that Seedance 2.0 endpoints do not support frames, seed, or camera_fixed for this version; several gateway-specific constraints exist (aspect_ratio, duration as enum or integer, and the presence of relationships between reference assets). It warns to verify live model card and activation status, and to fetch prices and limits at preflight rather than hardcoding values. It also cautions about reproducibility being gateway-specific and to follow the active endpoint’s schema for media labeling and prompts.