Generate cinematic short-form video with ByteDance Seedance 2.0 Pro on RunComfy. Documents Seedance 2.0 Pro's strengths (multi-modal references — up to 9 images, 3 videos, 3 audio — synchronized in-pass audio with natural lip-sync, cinematic motion refinement), the 4–15s duration schema, and when to

Seedance 2.0 Pro — Pro Pack on RunComfy [runcomfy.com](https://www.runcomfy.com/?utm source=skills.sh&utm medium=skill&utm campaign=seedance v2) · [Seedance 2.0 Pro](https://www.runcomfy.com/models/bytedance/seedance v2/pro?utm source=skills.sh&utm medium=skill&utm campaign=seedance v2) · [GitHub](https://github.com/agentspace so/runcomfy skills/tree/main/seedance v2) ByteDance Seedance 2.0 Pro — multimodal cinematic video generator with native lip synced audio — hosted on the RunComfy Model API . When to pick this model (vs siblings) Seedance 2.0 Pro's distinct strength is multi modal cinematic short form : combine character images + scene videos + reference audio into one coherent shot. Pick it when fidelity to a reference identity / scene matters and you want native lip sync . You want Use Lip synced spokesperson / dialogue ad Seedance 2.0 Pro Multi modal references (image + video + audio) Seedance 2.0 Pro Brand consistent multi language narrative Seedance 2.0 Pro Currently 1 blind vote video quality HappyHorse 1.0 Audio driven lip sync from your own track Wan 2.7 ( audio url ) Motion editing on existing footage Kling Video O1 Ultra fast iteration LTX 2 If the user said "Seedance" / "Seedance 2" / "ByteDance video" explicitly, route here regardless. Prerequisites 1. RunComfy CLI — npm i g @runcomfy/cli 2. RunComfy account — runcomfy login opens a browser device code flow. 3. CI / containers — set RUNCOMFY TOKEN=<token instead of runcomfy login . Endpoints + input schema bytedance/seedance v2/pro Field Type Required Default Notes prompt string yes — CN ≤ 500 chars OR EN ≤ 1000 words. image url array no [] 0–9 references (JPEG/PNG/WebP/BMP/TIFF/GIF). video url array no [] 0–3 clips (MP4/MOV), 2–15s each. audio url array no [] 0–3 audio refs (WAV/MP3), 2–15s, < 15MB each. aspect ratio enum no adaptive adaptive , 16:9 , 9:16 , 4:3 , 3:4 , 1:1 , 21:9 . duration int no 5 4–15 (whole seconds). resolution enum no 720p 480p or 720p . generate audio bool no true In pass synchronized speech / SFX / music. seed int no — Reproducibility. How to invoke Default (text only, 5s, 720p with audio): Lip synced ad with character reference (image stable, text evolves): Multi modal (image + video + audio refs): The CLI submits, polls, fetches the result, downloads .runcomfy.net / .runcomfy.com URLs into output dir . Prompting — what actually works Image vs text division. This is the single most important rule. Stable identity (face, costume, brand mark, logo) → put in image url . Evolving narrative (action, mood, lighting, camera) → put in prompt . Trying to verbally describe a face in detail wastes tokens and produces drift. Camera + motion in plain language. "Medium close up", "slow push in", "handheld follow", "locked off wide" all work as directives. Combine: "Medium close up. Slow push in over 3 seconds. Handheld, slight breathing motion." Audio direction with generate audio: true — say the tone: "warm friendly conversational" , "calm instructional" , "crisp newsroom delivery" . For ambient: "gentle cafe chatter, distant traffic, no foreground music" . Reference media specs — videos must be 2–15s; audio must be ≤15MB and 2–15s. Out of range files reject. Match aspect ratio of refs to your output to avoid crops. Anti patterns: Mixing radically different aesthetic refs (watercolor + photoreal) → confuses. Conflicting style cues in prompt → simplify by removing contradictions. Trying to describe stable identity verbally → use image url instead. Asking for 15s clips → 422; segment into multiple calls. Where it shines Use case Why Seedance 2.0 Pro Spokesperson / dialogue ads Native in pass lip sync, no separate TTS step Brand consistent multi language narratives Image refs hold identity; text drives translation Cinematic short form film previs Camera shot grammar + multi modal refs Ad creatives with reference music / VO tone Audio refs guide voice / mood without locking lip sync Reproducible variant testing Seed control + fixed schema Sample prompts (verified to produce strong results) Default playground example: Multi modal lip sync (text + image): Limitations Duration 4–15s — no longer clips on this endpoint. Resolution ceiling 720p on the playground variant. Reference media specs — videos / audio must be 2–15s; audio < 15MB. Lip sync quality — depends on prompt clarity; not guaranteed perfect under all conditions. No @ syntax for character binding — relies on image refs + prompt alignment. Exit codes code meaning 0 success 64 bad CLI args 65 bad input JSON / schema mismatch 69 upstream 5xx 75 retryable: timeout / 429 77 not signed in or token rejected Full reference: [docs.runcomfy.com/cli/troubleshooting](https://docs.runcomfy.com/cli/troubleshooting?utm source=skills.sh&utm medium=skill&utm campaign=seedance v2). How it works The skill invokes runcomfy run bytedance/seedance v2/pro with a JSON body matching the schema. The CLI POSTs to https://model api.runcomfy.net/v1/models/bytedance/seedance v2/pro , polls the request, fetches the result, and downloads any .runcomfy.net / .runcomfy.com URL into output dir . Ctrl C cancels the remote request before exit. Security & Privacy Token storage : runcomfy login writes the API token to ~/.config/runcomfy/token.json with mode 0600 (owner only read/write). Set RUNCOMFY TOKEN env var to bypass the file entirely in CI / containers. Input boundary : the user prompt is passed as a JSON string to the CLI via input . The CLI does NOT shell expand the prompt; it transmits the JSON body directly to the Model API over HTTPS. No shell injection surface from prompt content. Third party content : image / mask / video URLs you pass are fetched by the RunComfy model server, not by the CLI on your machine. Treat external URLs as untrusted; image based prompt injection is a known risk for any image edit / video edit model. Outbound endpoints : only model api.runcomfy.net (request submission) and .runcomfy.net / .runcomfy.com (download whitelist for generated outputs). No telemetry, no callbacks. Generated file size cap : the CLI aborts any single download 2 GiB to prevent disk fill from a malicious or runaway model output.

seedance-v2