Seedance 2.0 - Upmore

Seedance 2.0 is ByteDance’s latest video generation model available through Upmore API. It supports text-to-video, image-to-video, multimodal reference input, video editing, video extension, and synchronized audio generation.

Key capabilities

Feature	Description
Text-to-video	Generate video from text prompts
Image-to-video (first frame)	Use an image as the first frame
Image-to-video (first + last frame)	Use two images as first and last frames
Multimodal reference	Combine images, videos, and audio as references (1–9 images, up to 3 videos, up to 3 audio clips)
Video editing	Modify elements in an existing video using reference images
Video extension	Extend and concatenate reference videos
Audio generation	Auto-generate synchronized voice, sound effects, and background music
Web search	Enhance generation with real-time internet content (text-to-video only)
Return last frame	Retrieve the last frame of generated video

Output specifications

Property	Value
Resolution	480p, 720p, 1080p
Aspect ratio	16:9, 4:3, 1:1, 3:4, 9:16, 21:9, adaptive
Duration	4–15 seconds
Format	mp4

Workflow

POST /v1/video/generations  →  task_id
Poll GET /v1/video/generations/{task_id}  →  status
When status = "succeeded"  →  download video URL (valid 24 hours)

Examples

Text-to-video

curl https://api.upmore.net/v1/video/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance",
    "content": [
      {
        "type": "text",
        "text": "A cat playing piano in a sunlit room, cinematic lighting"
      }
    ],
    "generate_audio": true,
    "ratio": "16:9",
    "duration": 8
  }'

import requests
import time

headers = {"Authorization": "Bearer YOUR_API_KEY", "Content-Type": "application/json"}

# Step 1: create task
resp = requests.post(
    "https://api.upmore.net/v1/video/generations",
    headers=headers,
    json={
        "model": "seedance",
        "content": [
            {"type": "text", "text": "A cat playing piano in a sunlit room, cinematic lighting"}
        ],
        "generate_audio": True,
        "ratio": "16:9",
        "duration": 8
    }
)
task_id = resp.json()["task_id"]

# Step 2: poll for result
while True:
    result = requests.get(
        f"https://api.upmore.net/v1/video/generations/{task_id}",
        headers=headers
    ).json()
    status = result["data"]["status"]
    if status == "SUCCESS":
        print("Video URL:", result["data"]["data"]["content"]["video_url"])
        break
    elif status == "FAILED":
        print("Failed:", result["data"].get("fail_reason"))
        break
    time.sleep(5)

Multimodal reference (image + video + audio)

cURL

curl https://api.upmore.net/v1/video/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance",
    "content": [
      {
        "type": "text",
        "text": "Extend the video with a smooth camera pan, festive atmosphere"
      },
      {
        "type": "image_url",
        "image_url": {"url": "https://example.com/character.jpg"},
        "role": "reference_image"
      },
      {
        "type": "video_url",
        "video_url": {"url": "https://example.com/clip.mp4"},
        "role": "reference_video"
      },
      {
        "type": "audio_url",
        "audio_url": {"url": "https://example.com/bgm.mp3"},
        "role": "reference_audio"
      }
    ],
    "generate_audio": true,
    "ratio": "16:9",
    "duration": 11
  }'

Video editing

cURL

curl https://api.upmore.net/v1/video/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance",
    "content": [
      {
        "type": "text",
        "text": "Replace the water bottle in the video with the perfume bottle from the image, keep camera movement unchanged"
      },
      {
        "type": "image_url",
        "image_url": {"url": "https://example.com/perfume.jpg"},
        "role": "reference_image"
      },
      {
        "type": "video_url",
        "video_url": {"url": "https://example.com/original.mp4"},
        "role": "reference_video"
      }
    ],
    "generate_audio": true,
    "ratio": "16:9",
    "duration": 5
  }'

Web search enhanced (text-to-video only)

cURL

curl https://api.upmore.net/v1/video/generations \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "seedance",
    "content": [
      {
        "type": "text",
        "text": "Macro shot of cherry blossoms in spring, petals falling slowly"
      }
    ],
    "generate_audio": true,
    "ratio": "16:9",
    "duration": 11,
    "tools": [{"type": "web_search"}]
  }'

Parameters

Parameter	Type	Required	Description
`model`	string	Yes	`seedance`
`content`	array	Yes	Input content array (text, image_url, video_url, audio_url items)
`content[].type`	string	Yes	`text`, `image_url`, `video_url`, or `audio_url`
`content[].text`	string	Text items	Text prompt (max 500 Chinese chars / 1000 English words)
`content[].image_url.url`	string	Image items	Image URL, Base64 data URI, or `asset://<ID>`
`content[].video_url.url`	string	Video items	Video URL or `asset://<ID>` (mp4/mov, max 50 MB, 2–15s)
`content[].audio_url.url`	string	Audio items	Audio URL, Base64 data URI, or `asset://<ID>` (wav/mp3, max 15 MB)
`content[].role`	string	Conditional	`first_frame`, `last_frame`, `reference_image`, `reference_video`, `reference_audio`
`generate_audio`	boolean	No	Generate synchronized audio. Default: `true`
`resolution`	string	No	`480p`, `720p`, or `1080p`. Default: `720p`
`ratio`	string	No	`16:9`, `4:3`, `1:1`, `3:4`, `9:16`, `21:9`, `adaptive`. Default: `adaptive`
`duration`	integer	No	4–15 seconds. Default: `5`
`tools`	array	No	`[{"type": "web_search"}]` for web search (text-to-video only)
`watermark`	boolean	No	Add watermark. Default: `false`

Input modes

Mode	Content items	`role` values
Text-to-video	1× text	—
Image-to-video (first frame)	text (optional) + 1× image_url	`first_frame` or omit
Image-to-video (first + last frame)	text (optional) + 2× image_url	`first_frame` + `last_frame`
Multimodal reference	text (optional) + image/video/audio	`reference_image`, `reference_video`, `reference_audio`
Video editing	text + image_url + video_url	`reference_image` + `reference_video`
Video extension	text + video_url(s)	`reference_video`

Note: First frame, first+last frame, and multimodal reference are mutually exclusive — do not mix them in the same request.

Resolution pixel values

Resolution	16:9	4:3	1:1	3:4	9:16	21:9
480p	864x496	752x560	640x640	560x752	496x864	992x432
720p	1280x720	1112x834	960x960	834x1112	720x1280	1470x630
1080p	1920x1080	1664x1248	1440x1440	1248x1664	1080x1920	2208x944

​Key capabilities

​Output specifications

​Workflow

​Examples

​Text-to-video

​Multimodal reference (image + video + audio)

​Video editing

​Web search enhanced (text-to-video only)

​Parameters

​Input modes

​Resolution pixel values

Key capabilities

Output specifications

Workflow

Examples

Text-to-video

Multimodal reference (image + video + audio)

Video editing

Web search enhanced (text-to-video only)

Parameters

Input modes

Resolution pixel values