seedance-v2

Original：🇺🇸 English

Translated

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 route to HappyHorse 1.0 / Wan 2.7 / Kling instead. Calls `runcomfy run bytedance/seedance-v2/pro` through the local RunComfy CLI. Triggers on "seedance", "seedance 2", "seedance v2", "seedance pro", "bytedance video", or any explicit ask to generate video with this model.

139installs

Sourceagentspace-so/runcomfy-agent-skills

Added on2026-04-30

NPX Install

npx skill4agent add agentspace-so/runcomfy-agent-skills seedance-v2

SKILL.md Content

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Seedance 2.0 Pro — Pro Pack on RunComfy

runcomfy.com · Seedance 2.0 Pro · GitHub

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

RunComfy CLI —
```
npm i -g @runcomfy/cli
```
RunComfy account —
```
runcomfy login
```
opens a browser device-code flow.
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 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:

Golden hour on a quiet cafe terrace: a barista wipes the counter, then
looks up and explains today's special in a friendly tone, natural
lip-sync. Medium close-up, slow push-in; warm side light, soft bokeh
through glass, gentle cafe ambience and subtle film grain.

Multi-modal lip-sync (text + image):

Same person as image 1 in a softly-lit recording booth, leaning into
the mic, says: "We just shipped the biggest update of the year."
Calm conversational tone. Medium close-up, locked tripod, shallow DOF,
warm key light from camera-left.

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.

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

NPX Install

Tags

SKILL.md Content

Seedance 2.0 Pro — Pro Pack on RunComfy

When to pick this model (vs siblings)

Prerequisites

Endpoints + input schema

`bytedance/seedance-v2/pro`

How to invoke

Prompting — what actually works

Where it shines

Sample prompts (verified to produce strong results)

Limitations

Exit codes

How it works

Security & Privacy