Install the belt CLI skill:
npx skills add belt-sh/cli
Seedance 2.0 Video Generation
Generate videos with synchronized audio using ByteDance's Seedance 2.0 via inference.sh CLI.
Quick Start
Requires inference.sh CLI (
belt). Install instructions
belt login
belt app run bytedance/seedance-2-0 --input '{
"prompt": "a jazz band performing in a dimly lit club",
"generate_audio": true
}'
Models
| Model | App ID | Best For |
|---|---|---|
| Seedance 2.0 | bytedance/seedance-2-0 | Best quality, up to 1080p |
| Seedance 2.0 Fast | bytedance/seedance-2-0-fast | Faster generation, up to 720p |
| Seedance 2.0 Studio | bytedance/seedance-2-0-studio | Quality + private asset library for portrait consistency |
| Seedance 2.0 Studio Fast | bytedance/seedance-2-0-studio-fast | Fast + private asset library for portrait consistency |
All models support text-to-video, image-to-video, multimodal reference-to-video, and synchronized audio generation. Studio variants automatically upload reference images to the BytePlus private virtual portrait library for enhanced character consistency - particularly useful for faces and branded characters.
Modes
The model determines the generation mode from your inputs. These modes are mutually exclusive - use either first-frame/last-frame OR reference inputs, not both.
| Mode | Inputs | Description |
|---|---|---|
| Text-to-Video | prompt only | Generate video from text description |
| Image-to-Video | prompt + image | Animate a still image (first frame) |
| First+Last Frame | prompt + image + end_image | Control start and end frames |
| Multimodal Reference | prompt + reference_images/reference_videos/reference_audios | Guide generation with reference material |
Examples
Text-to-Video with Audio
belt app run bytedance/seedance-2-0 --input '{
"prompt": "ocean waves crashing on rocks during a storm, dramatic cinematic shot",
"generate_audio": true,
"duration": 10,
"ratio": "16:9"
}'
Fast Mode (Cheaper)
belt app run bytedance/seedance-2-0-fast --input '{
"prompt": "a butterfly landing on a flower in slow motion",
"generate_audio": true
}'
Image-to-Video
Animate a still image into a video:
belt app run bytedance/seedance-2-0 --input '{
"image": "https://your-image.jpg",
"prompt": "gentle camera movement, leaves rustling in the wind",
"generate_audio": true
}'
Image-to-Video with Start and End Frames
belt app run bytedance/seedance-2-0 --input '{
"image": "https://start-frame.jpg",
"end_image": "https://end-frame.jpg",
"prompt": "smooth transition between scenes",
"generate_audio": true
}'
Multi-Image Reference
Use multiple reference images to guide character appearance, outfits, and scene elements:
belt app run bytedance/seedance-2-0 --input '{
"prompt": "The girl from Image 1 wearing the outfit from Image 2 walks through the cafe from Image 3",
"reference_images": [
"https://character-portrait.jpg",
"https://outfit-reference.jpg",
"https://cafe-scene.jpg"
],
"generate_audio": true,
"duration": 8
}'
Video Editing (Replace Elements)
belt app run bytedance/seedance-2-0 --input '{
"prompt": "Replace the perfume in Video 1 with the face cream from Image 1, preserving all original motions and camera work",
"reference_images": ["https://face-cream.jpg"],
"reference_videos": ["https://original-video.mp4"],
"generate_audio": true
}'
Video Extension (Stitch Clips)
belt app run bytedance/seedance-2-0 --input '{
"prompt": "Video 1 transitions smoothly into Video 2, then the camera enters the painting from Video 3",
"reference_videos": [
"https://clip1.mp4",
"https://clip2.mp4",
"https://clip3.mp4"
],
"generate_audio": true,
"duration": 8
}'
Reference with Audio
belt app run bytedance/seedance-2-0 --input '{
"prompt": "The musician from Image 1 performs the song from Audio 1, voice style referenced from Audio 1",
"reference_images": ["https://musician.jpg"],
"reference_audios": ["https://music.mp3"],
"generate_audio": true
}'
Studio Mode (Portrait Consistency)
Studio variants upload images to BytePlus's private asset library for enhanced face/character consistency:
belt app run bytedance/seedance-2-0-studio --input '{
"prompt": "The person in Image 1 smiles at the camera, golden hour lighting, cinematic",
"reference_images": ["https://portrait.jpg"],
"safety_identifier": "user-abc123",
"generate_audio": true
}'
Product Ad with Multiple References
belt app run bytedance/seedance-2-0 --input '{
"prompt": "First-person POV product ad. Opening frame is Image 1, hand picks up the product. Camera pushes into close-up showing details. Use the camera movement style from Video 1. Background music from Audio 1.",
"reference_images": ["https://product-hero.jpg", "https://product-detail.jpg"],
"reference_videos": ["https://camera-style.mp4"],
"reference_audios": ["https://bgm.mp3"],
"generate_audio": true,
"ratio": "9:16",
"duration": 11
}'
Prompt Guide
Reference assets in your prompt using type + index: Image 1, Image 2, Video 1, Audio 1. The index is the position within that type in the arrays you provide. Do NOT use asset IDs in prompts.
Multimodal reference formula:
- Image reference: "Refer to the [subject] from [Image N] to generate [scene], keeping [subject] consistent"
- Video reference: "Refer to the [camera movement/action] from [Video N]"
- Audio reference: "[Character] says: [dialogue], voice style referenced from [Audio N]"
Video editing formula:
- Add: "At [timing] of [Video N], add [element]"
- Remove: "Remove [element] from [Video N], keeping the rest unchanged"
- Modify: "Replace [element] in [Video N] with [new element]"
Video extension formula:
- Forward: "Generate content after [Video N]: [description]"
- Backward: "Extend the opening of [Video N]: [description]"
- Stitch: "[Video 1] + [transition] + followed by [Video 2]"
Parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
prompt | string | required | Text description of the video |
generate_audio | boolean | true | Generate synchronized audio |
duration | integer | 5 | Duration in seconds (4-15), or -1 for auto |
ratio | enum | adaptive | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, or adaptive |
resolution | enum | 720p | 480p, 720p, 1080p (Fast: 480p, 720p only) |
seed | integer | -1 | Seed for reproducibility (-1 for random) |
watermark | boolean | false | Add watermark to output |
safety_identifier | string | - | Unique end-user identifier for safety policy (max 64 chars, hash of user ID recommended) |
image | file | - | First-frame image (mutually exclusive with reference inputs) |
end_image | file | - | Last-frame image (requires image) |
reference_images | file[] | - | Reference images, up to 9 (mutually exclusive with image/end_image) |
reference_videos | file[] | - | Reference videos, up to 3. Max 15s each, total max 15s. mp4/mov |
reference_audios | file[] | - | Reference audios, up to 3. Max 15s each, total max 15s. wav/mp3. Requires at least one image or video |
Pricing
| Model | Pricing |
|---|---|
| Seedance 2.0 | $4.30-$7.70/M tokens (varies by resolution and input type) |
| Seedance 2.0 Fast | $3.30-$5.60/M tokens |
Token formula: (width x height x fps x duration) / 1024
Search Seedance Apps
belt app search "seedance"
Related Skills
# Full platform skill (all apps)
npx skills add inference-sh/skills@infsh-cli
# All video generation models
npx skills add inference-sh/skills@ai-video-generation
# Google Veo
npx skills add inference-sh/skills@google-veo
# Image generation (for image-to-video)
npx skills add inference-sh/skills@ai-image-generation
# AI avatars & lipsync
npx skills add inference-sh/skills@ai-avatar-video
Browse all video apps: belt app list --category video
Documentation
- Running Apps - How to run apps via CLI
- Streaming Results - Real-time progress updates
- Content Pipeline Example - Building media workflows