SeeDance 1.0 Pro Fast API | ByteDance Video Generation

What is SeeDance 1.0 Pro Fast?

SeeDance 1.0 Pro Fast is the speed-oriented SeeDance 1.0 route for prompt-led generation. It exposes two modes on Unifically: text-to-video and image-to-video using a first frame. Unlike SeeDance 1.0 Pro, it does not accept a last frame, so choose it when quick prompt iteration or animating a single source image matters more than controlling the exact closing composition.

The route supports 4–12 second videos in whole-second increments and 480p, 720p, or 1080p output. Text-to-video offers six aspect ratios: 1:1, 3:4, 4:3, 9:16, 16:9, and 21:9. Image-to-video uses the uploaded first frame as its visual source. Optional camera and seed controls let you specify a stable viewpoint and keep an evaluation setup reproducible. ByteDance publishes the wider family's background in its Seedance technical report announcement; the Unifically endpoint reference lists the live request fields.

Key features of SeeDance 1.0 Pro Fast

Text-to-video and image-to-video

Start with only a prompt or add a first frame. The two modes cover open-ended drafts and shots that need an existing visual anchor.

4–12 second videos

Set any whole-second duration from 4 through 12, rather than choosing from only a few fixed presets.

Output up to 1080p

Use 480p or 720p for iteration and 1080p when a selected result needs a higher-resolution delivery file.

Six prompt-led formats

Text-to-video covers square, vertical, landscape, and ultrawide layouts without requiring a source image.

Best for

Fast prompt exploration

Generate several short concepts before moving a selected direction into a more controlled workflow.

Social video variants

Create 9:16, 1:1, and 16:9 versions for different placements from related prompts.

Single-image animation

Add motion to an approved image when controlling an exact end frame is unnecessary.

Draft-to-delivery iteration

Evaluate motion at a lower resolution, then rerun a selected setup at 1080p.

Stable viewpoint shots

Use camera_fixed for demonstrations or compositions where large camera motion would be distracting.

Use cases

Draft multiple ad concepts from text at 480p, keeping each prompt and seed in an evaluation sheet, then rerun the chosen setup at 1080p. Animate a product or character image into a short clip without defining a separate closing frame. Produce platform-specific versions by changing the text-to-video aspect ratio while holding the rest of the request constant. For comparisons, do not mix a new prompt, duration, and resolution in the same test: controlled changes produce evidence that is easier to reuse in a model review or integration decision.

API examples

The same /v1/tasks endpoint handles both modes. This request uses text-to-video; switch mode to image_to_video and add first_frame_url for a source-image workflow. Check the parameter reference before production use.

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "bytedance/seedance-1.0-pro-fast",
    "input": {
      "mode": "text_to_video",
      "prompt": "A locked-off studio shot of a glass sculpture rotating slowly",
      "aspect_ratio": "9:16",
      "duration": 6,
      "resolution": "720p",
      "camera_fixed": true,
      "seed": 42
    }
  }'

The API returns a task_id. Poll GET /v1/tasks/<task_id> or provide a callback URL to handle completion without keeping the request open.

FAQs

SeeDance 1.0 Pro Fast

What is SeeDance 1.0 Pro Fast?#

Key features of SeeDance 1.0 Pro Fast#