Veo3.1 First Last Frame To Video API

Endpoint: POST https://fal.run/fal-ai/veo3.1/first-last-frame-to-video Endpoint ID: fal-ai/veo3.1/first-last-frame-to-video

Try it in the Playground

Run this model interactively with your own prompts.

Quick Start

import fal_client

def on_queue_update(update):
    if isinstance(update, fal_client.InProgress):
        for log in update.logs:
           print(log["message"])

result = fal_client.subscribe(
    "fal-ai/veo3.1/first-last-frame-to-video",
    arguments={
        "prompt": "A woman looks into the camera, breathes in, then exclaims energetically, \"have you guys checked out Veo3.1 First-Last-Frame-to-Video on Fal? It's incredible!\"",
        "first_frame_url": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-1.jpeg",
        "last_frame_url": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-2.jpeg"
    },
    with_logs=True,
    on_queue_update=on_queue_update,
)
print(result)

import { fal } from "@fal-ai/client";

const result = await fal.subscribe("fal-ai/veo3.1/first-last-frame-to-video", {
  input: {
      prompt: "A woman looks into the camera, breathes in, then exclaims energetically, \"have you guys checked out Veo3.1 First-Last-Frame-to-Video on Fal? It's incredible!\"",
      first_frame_url: "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-1.jpeg",
      last_frame_url: "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-2.jpeg"
    },
  logs: true,
  onQueueUpdate: (update) => {
    if (update.status === "IN_PROGRESS") {
      update.logs.map((log) => log.message).forEach(console.log);
    }
  },
});
console.log(result.data);
console.log(result.requestId);

curl --request POST \
  --url https://fal.run/fal-ai/veo3.1/first-last-frame-to-video \
  --header "Authorization: Key $FAL_KEY" \
  --header "Content-Type: application/json" \
  --data '{
  "prompt": "A woman looks into the camera, breathes in, then exclaims energetically, \"have you guys checked out Veo3.1 First-Last-Frame-to-Video on Fal? It'\''s incredible!\"",
  "first_frame_url": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-1.jpeg",
  "last_frame_url": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-2.jpeg"
}'

Veo 3.1 — Video Generation
Veo 3.1 Fast — Video Generation
Veo3.1 Lite Image to Video — Video Generation
Veo3.1 Lite FLF — Video Generation
Veo3.1 Lite Text to Video — Video Generation

Capabilities

Text prompt input
Aspect ratio control
Duration control
Negative prompts
Reproducible generation (seed)

API Reference

Input Schema

string

required

The text prompt describing the video you want to generate

AspectRatioEnum

default:"auto"

The aspect ratio of the generated video. Default value: "auto"Possible values: auto, 16:9, 9:16

DurationEnum

default:"8s"

The duration of the generated video. Default value: "8s"Possible values: 4s, 6s, 8s

string

A negative prompt to guide the video generation.

ResolutionEnum

default:"720p"

The resolution of the generated video. Default value: "720p"Possible values: 720p, 1080p, 4k

boolean

default:"true"

Whether to generate audio for the video. Default value: true

integer

The seed for the random number generator.

boolean

default:"false"

Whether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them.

SafetyToleranceEnum

default:"4"

The safety tolerance level for content moderation. 1 is the most strict (blocks most content), 6 is the least strict. Default value: "4"Possible values: 1, 2, 3, 4, 5, 6

string

required

URL of the first frame of the video

string

required

URL of the last frame of the video

Output Schema

File

required

The generated video.

Input Example

{
  "prompt": "A woman looks into the camera, breathes in, then exclaims energetically, \"have you guys checked out Veo3.1 First-Last-Frame-to-Video on Fal? It's incredible!\"",
  "aspect_ratio": "auto",
  "duration": "8s",
  "resolution": "720p",
  "generate_audio": true,
  "auto_fix": false,
  "safety_tolerance": "4",
  "first_frame_url": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-1.jpeg",
  "last_frame_url": "https://storage.googleapis.com/falserverless/example_inputs/veo31-flf2v-input-2.jpeg"
}

Output Example

{
  "video": {
    "url": "https://storage.googleapis.com/falserverless/example_outputs/veo31-flf2v-output.mp4"
  }
}

Limitations

aspect_ratio restricted to: auto, 16:9, 9:16
duration restricted to: 4s, 6s, 8s
resolution restricted to: 720p, 1080p, 4k
safety_tolerance restricted to: 1, 2, 3, 4, 5, 6

Video Generation

Image Generation

Audio

Vision

3D

Veo3.1 First Last Frame To Video API

Try it in the Playground

Quick Start

Capabilities

API Reference

Input Schema

Output Schema

Input Example

Output Example

Limitations

Try it in the Playground

​Quick Start

​Related

​Capabilities

​API Reference

​Input Schema

​Output Schema

​Input Example

​Output Example

​Limitations

Quick Start

Related

Capabilities

API Reference

Input Schema

Output Schema

Input Example

Output Example

Limitations