Seedance V2

# 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**.

```bash npx skills add agentspace-so/runcomfy-skills --skill seedance-v2 -g ```

## 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):**

```bash runcomfy run bytedance/seedance-v2/pro \ --input '{"prompt": "<user prompt>"}' \ --output-dir <absolute/path> ```

**Lip-synced ad with character reference (image-stable, text-evolves):**

```bash runcomfy run bytedance/seedance-v2/pro \ --input '{ "prompt": "Medium close-up. The woman explains today'\''s special in a warm friendly tone, slow push-in, soft window light, gentle cafe ambience.", "image_url": ["https://.../barista-headshot.jpg"], "duration": 8, "aspect_ratio": "9:16" }' \ --output-dir <absolute/path> ```

**Multi-modal (image + video + audio refs):**

```bash runcomfy run bytedance/seedance-v2/pro \ --input '{ "prompt": "Subject from image 1 walks through the café from video 1, voice tone matches audio 1.", "image_url": ["https://.../subject.jpg"], "video_url": ["https://.../cafe-locked-shot.mp4"], "audio_url": ["https://.../voice-ref.mp3"] }' \ --output-dir <absolute/path> ```

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