Seedance 1.5 Pro: Cinematic Video Generation with Built-in Audio & Lip Sync | RunComfy
bytedance/seedance-v1.5-pro/image-to-video
Seedance 1.5 Pro generates cinematic, multilingual videos from text or images with synchronized dialogue, camera control, and seamless audio-visual storytelling for ads, dubbing, and creative short productions.
Table of contents
1. Get started
Use RunComfy's API to run bytedance/seedance-v1.5-pro/image-to-video. For accepted inputs and outputs, see the model's schema.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/bytedance/seedance-v1.5-pro/image-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "A gentle breeze blows softly, and the real girl's body remains stable. Her long hair, including the hair below, flutters naturally. The anime girl on the phone screen first closes her eyes for 2 seconds, then slowly opens them, with her mouth remaining still and silent. Her hair, including the hair below, also flutters naturally in the breeze in perfect synchronization. The rhythm and direction of the hair fluttering of the two girls are exactly the same. The subway train moves rapidly, emitting a low rumbling echo. ",
"first_frame_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7272/media-files/input-1-1.png"
}'2. Authentication
Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.
3. API reference
Submit a request
Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/bytedance/seedance-v1.5-pro/image-to-video \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "A gentle breeze blows softly, and the real girl's body remains stable. Her long hair, including the hair below, flutters naturally. The anime girl on the phone screen first closes her eyes for 2 seconds, then slowly opens them, with her mouth remaining still and silent. Her hair, including the hair below, also flutters naturally in the breeze in perfect synchronization. The rhythm and direction of the hair fluttering of the two girls are exactly the same. The subway train moves rapidly, emitting a low rumbling echo. ",
"first_frame_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7272/media-files/input-1-1.png"
}'Monitor request status
Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
--header "Authorization: Bearer <token>"Retrieve request results
Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
--header "Authorization: Bearer <token>"Cancel a request
Cancel a queued job by request_id, in-progress jobs cannot be cancelled.
curl --request POST \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
--header "Authorization: Bearer <token>"4. File inputs
Hosted file (URL)
Provide a publicly reachable HTTPS URL. Ensure the host allows server‑side fetches (no login/cookies required) and isn't rate‑limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre‑signed URLs for private assets.
5. Schema
Input schema
{
"type": "object",
"title": "Input",
"required": [
"prompt",
"first_frame_image_url"
],
"properties": {
"prompt": {
"title": "Prompt",
"description": "The prompt should be less than 500 characters to get better results.",
"type": "string",
"default": "A gentle breeze blows softly, and the real girl's body remains stable. Her long hair, including the hair below, flutters naturally. The anime girl on the phone screen first closes her eyes for 2 seconds, then slowly opens them, with her mouth remaining still and silent. Her hair, including the hair below, also flutters naturally in the breeze in perfect synchronization. The rhythm and direction of the hair fluttering of the two girls are exactly the same. The subway train moves rapidly, emitting a low rumbling echo. "
},
"first_frame_image_url": {
"title": "Start Image",
"description": "",
"type": "string",
"validations": [
{
"validation_rule": "width_pixels<",
"validation_value": 6000,
"validation_error": "The uploaded image width and height must not exceed 6000 pixels."
},
{
"validation_rule": "height_pixels<",
"validation_value": 6000,
"validation_error": "The uploaded image width and height must not exceed 6000 pixels."
},
{
"validation_rule": "width_pixels>",
"validation_value": 300,
"validation_error": "The uploaded image width and height must not be less than 300 pixels."
},
{
"validation_rule": "height_pixels>",
"validation_value": 300,
"validation_error": "The uploaded image width and height must not be less than 300 pixels."
},
{
"validation_rule": "width/height>",
"validation_value": 0.4,
"validation_error": "The aspect ratio range should be between 0.4 and 2.5."
},
{
"validation_rule": "width/height<",
"validation_value": 2.5,
"validation_error": "The aspect ratio range should be between 0.4 and 2.5."
},
{
"validation_rule": "file_size_mb<",
"validation_value": 30,
"validation_error": "File size must be less than 30 MB."
}
],
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7272/media-files/input-1-1.png"
},
"resolution": {
"title": "Resolution",
"description": "",
"type": "string",
"enum": [
"480p",
"720p"
],
"default": "480p"
},
"ratio": {
"title": "Aspect Ratio (W:H)",
"description": "",
"type": "string",
"enum": [
"16:9",
"4:3",
"1:1",
"3:4",
"9:16",
"21:9",
"adaptive"
],
"default": "adaptive"
},
"duration": {
"title": "Duration",
"description": "",
"type": "integer",
"enum": [
4,
5,
6,
7,
8,
9,
10,
11,
12
],
"default": 5
},
"generate_audio": {
"title": "Generate Audio",
"description": "",
"type": "boolean",
"default": true
},
"camera_fixed": {
"title": "Camera Fixed",
"description": "Whether to fix the camera in the video.",
"type": "boolean",
"default": true
}
}
}Output schema
{
"output": {
"type": "object",
"properties": {
"image": {
"type": "string",
"format": "uri",
"description": "single image URL"
},
"video": {
"type": "string",
"format": "uri",
"description": "single video URL"
},
"images": {
"type": "array",
"description": "multiple image URLs",
"items": { "type": "string", "format": "uri" }
},
"videos": {
"type": "array",
"description": "multiple video URLs",
"items": { "type": "string", "format": "uri" }
}
}
}
}Video Models/Tools
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