Seedance 2 First & Last Frame Fast: AI Image-to-Video Generator
SD 2 First & Last Frame (Fast) by ByteDance. Quickly generate video that transitions between reference images at reduced cost. Provide 1 or 2 images.
SD 2 First & Last Frame (Fast) by ByteDance. Quickly generate video that transitions between reference images at reduced cost. Provide 1 or 2 images.
About this model
SD 2 First & Last Frame (Fast) quickly generates video that transitions between reference images at lower cost. Provide one or two images to anchor the opening and closing frames, with 4–15 second duration.
Cost analysis
| Provider | Cost | Notes |
|---|---|---|
| muapiapp | $0.15 per second (e.g. $0.75 for 5 seconds) | Pay per second of video generated. |
| Fal.ai | $0.3024/sec (high) / $0.2419/sec (basic) | Fal.ai charges $0.3024/sec for high quality and $0.2419/sec for basic. muapiapp Fast at $0.15/sec is 50% cheaper than Fal.ai's basic rate. |
| Replicate | $0.3024/sec (high) / $0.2419/sec (basic) | Replicate charges the same as Fal.ai — $0.3024/sec (high), $0.2419/sec (basic). muapiapp Fast at $0.15/sec is 50% cheaper than Replicate's basic rate. |
Pay per second of video generated.
Fal.ai charges $0.3024/sec for high quality and $0.2419/sec for basic. muapiapp Fast at $0.15/sec is 50% cheaper than Fal.ai's basic rate.
Replicate charges the same as Fal.ai — $0.3024/sec (high), $0.2419/sec (basic). muapiapp Fast at $0.15/sec is 50% cheaper than Replicate's basic rate.
* Competitor pricing is estimated based on similar model architectures and usage tiers.
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Prompt | string | Text description guiding the transition between frames. | Two people having a street interview, the interviewer holds a microphone. |
| Frame Images | array | 1 image = first frame only; 2 images = first and last frame. Use 'adaptive' aspect ratio to match the reference image geometry. | https://d3adwkbyhxyrtq.cloudfront.net/ai-images/186/712345784292/4a8c5c70-abcc-4920-873e-b0e219986453.jpg |
| Aspect Ratio | Enum (7 options) | Output video aspect ratio. 'adaptive' matches the reference image (recommended); concrete ratios may crop or pad. | adaptive |
| Duration (seconds) | int | Video duration in seconds. | 5 |
Text description guiding the transition between frames.
Two people having a street interview, the interviewer holds a microphone.1 image = first frame only; 2 images = first and last frame. Use 'adaptive' aspect ratio to match the reference image geometry.
https://d3adwkbyhxyrtq.cloudfront.net/ai-images/186/712345784292/4a8c5c70-abcc-4920-873e-b0e219986453.jpgOutput video aspect ratio. 'adaptive' matches the reference image (recommended); concrete ratios may crop or pad.
adaptiveVideo duration in seconds.
5Developer documentation
Upload 1 or 2 images: Provide images via images_list. First image = opening frame, second image (optional) = closing frame.
Write your prompt: Describe the transition or motion between frames.
Set duration: Between 4 and 15 seconds.
Submit and poll: Use the returned request_id to poll for results.
Frequently asked
No. One image anchors just the first frame. Two images constrain both the start and end of the video.
The Fast model is quicker and cheaper with a slight reduction in output quality compared to the Pro variant.
JPEG, PNG, WebP, and BMP are supported.