falVideo to videoComing soon

blackforestlabs/flux-3/extend-video

Name: blackforestlabs/flux-3/extend-video
Brand: fal

blackforestlabs/flux-3/extend-video is a video to video tool from fal that runs in the background and returns video. Coming soon: listed with its price, not yet open to runs.

This tool is listed but not yet available to run.

Priced by usage

Pricing

duration: 5 $1.3325, 6 $1.599, 7 $1.8655, 8 $2.132, 9 $2.3985, 10 $2.665, 11 $2.9315, 12 $3.198, 13 $3.4645, 14 $3.731, 15 $3.9975, 16 $4.264, 17 $4.5305, 18 $4.797, 19 $5.0635, 20 $5.33, otherwise $5.33 per run. The final charge comes from usage.

Limits

Runs: In the background
Returns: video
Longest queue wait: 3600s
Run deadline: 1800s
Largest inline input: 1024 KB
Largest input file: 500 MB
Largest output: 4768 MB
Outputs per run: 16

Input

Field	Kind	Default	Description
`prompt` required	text	—	The text prompt describing how the video continues from the source clip's final frames.
`aspect_ratio`	one of auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16	auto	Aspect ratio of the generated video. `auto` lets the model choose.
`resolution`	one of 720p, 1080p, 1440p, 2160p	720p	Resolution of the generated video. `1080p`, `1440p` (2K) and `2160p` (4K) are finished by the video upsampler; exact dimensions depend on the aspect ratio.
`duration`	one of auto, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20	auto	Duration of the generated video in seconds. `auto` lets the model choose.
`generate_audio`	true or false	true	Whether to generate audio for the video.
`safety_tolerance`	number (whole) 0 to 4	2	The safety tolerance level for the generated video. 0 is the strictest and 4 is the most permissive.
`video_url` required	URL or file	—	URL of the input video. MP4, under 50 MB and under 15 seconds.

Same request in code

curl https://api.spiral.ai/v1/runs \
  -H "Authorization: Bearer $SPIRAL_API_KEY" \
  -H "Content-Type: application/json" \
  -H "Idempotency-Key: $(uuidgen)" \
  -d '{
    "provider": "fal",
    "model": "blackforestlabs/flux-3/extend-video",
    "input": {
      "prompt": "The camera keeps tracking as the subject turns and smiles.",
      "video_url": "https://storage.googleapis.com/falserverless/example_inputs/flux-3-red-panda.mp4"
    }
  }'