Bytedance Seedance V1.5 Pro API

Image To Video
Text To Video

Endpoint: POST https://fal.run/fal-ai/bytedance/seedance/v1.5/pro/image-to-video Endpoint ID: fal-ai/bytedance/seedance/v1.5/pro/image-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/bytedance/seedance/v1.5/pro/image-to-video",
    arguments={
        "prompt": "A man is crying and he says \"I shouldn't have done it. I regret everything\"",
        "image_url": "https://v3b.fal.media/files/b/0a8773cd/REzCWn1BKUVuMFTxR-R3W_image_317.png"
    },
    with_logs=True,
    on_queue_update=on_queue_update,
)
print(result)

Input Schema

prompt

string

required

The text prompt used to generate the video

aspect_ratio

AspectRatioEnum

default:"16:9"

The aspect ratio of the generated video Default value: "16:9"Possible values: 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, auto

resolution

ResolutionEnum

default:"720p"

Video resolution - 480p for faster generation, 720p for balance, 1080p for higher quality Default value: "720p"Possible values: 480p, 720p, 1080p

duration

DurationEnum

default:"5"

Duration of the video in seconds Default value: "5"Possible values: 4, 5, 6, 7, 8, 9, 10, 11, 12

camera_fixed

boolean

default:"false"

Whether to fix the camera position

seed

integer

Random seed to control video generation. Use -1 for random.

enable_safety_checker

boolean

default:"true"

If set to true, the safety checker will be enabled. Default value: true

generate_audio

boolean

default:"true"

Whether to generate audio for the video Default value: true

image_url

string

required

The URL of the image used to generate video

end_image_url

string

The URL of the image the video ends with. Defaults to None.

Output Schema

video

File

required

Generated video file

seed

integer

required

Seed used for generation

Input Example

{
  "prompt": "A man is crying and he says \"I shouldn't have done it. I regret everything\"",
  "aspect_ratio": "16:9",
  "resolution": "720p",
  "duration": "5",
  "camera_fixed": false,
  "enable_safety_checker": true,
  "generate_audio": true,
  "image_url": "https://v3b.fal.media/files/b/0a8773cd/REzCWn1BKUVuMFTxR-R3W_image_317.png"
}

Output Example

{
  "video": {
    "url": "https://v3b.fal.media/files/b/0a8773d3/l2fk-fIO_PQFPzbvHkQX1_video.mp4"
  },
  "seed": 42
}

Endpoint: POST https://fal.run/fal-ai/bytedance/seedance/v1.5/pro/text-to-video Endpoint ID: fal-ai/bytedance/seedance/v1.5/pro/text-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/bytedance/seedance/v1.5/pro/text-to-video",
    arguments={
        "prompt": "Defense attorney declaring \"Ladies and gentlemen, reasonable doubt isn't just a phrase, it's the foundation of justice itself\", footsteps on marble, jury shifting, courtroom drama, closing argument power."
    },
    with_logs=True,
    on_queue_update=on_queue_update,
)
print(result)

Input Schema

prompt

string

required

The text prompt used to generate the video

aspect_ratio

AspectRatioEnum

default:"16:9"

The aspect ratio of the generated video Default value: "16:9"Possible values: 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, auto

resolution

ResolutionEnum

default:"720p"

Video resolution - 480p for faster generation, 720p for balance, 1080p for higher quality Default value: "720p"Possible values: 480p, 720p, 1080p

duration

DurationEnum

default:"5"

Duration of the video in seconds Default value: "5"Possible values: 4, 5, 6, 7, 8, 9, 10, 11, 12

camera_fixed

boolean

default:"false"

Whether to fix the camera position

seed

integer

Random seed to control video generation. Use -1 for random.

enable_safety_checker

boolean

default:"true"

If set to true, the safety checker will be enabled. Default value: true

generate_audio

boolean

default:"true"

Whether to generate audio for the video Default value: true

Output Schema

video

File

required

Generated video file

seed

integer

required

Seed used for generation

Input Example

{
  "prompt": "Defense attorney declaring \"Ladies and gentlemen, reasonable doubt isn't just a phrase, it's the foundation of justice itself\", footsteps on marble, jury shifting, courtroom drama, closing argument power.",
  "aspect_ratio": "16:9",
  "resolution": "720p",
  "duration": "5",
  "camera_fixed": false,
  "enable_safety_checker": true,
  "generate_audio": true
}

Output Example

{
  "video": {
    "url": "https://v3b.fal.media/files/b/0a87743e/0K5lW0v-iC_BbKo64o0cA_video.mp4"
  },
  "seed": 42
}

Animate any image into a cinematic video with synchronized audio. Upload a start frame and optionally an end frame and Seedance 1.5 Pro generates the motion, camera movement, dialogue, and sound design in between.

Use Cases

Use Case	Why Seedance 1.5 Pro fits
Photo animation	Breathe life into a still portrait or product shot with realistic motion and ambient sound.
Character animation	Turn concept art or a single character frame into a speaking, emoting performance with lip-sync.
Product reveals	Start on a hero shot, end on packaging — the model animates the transition with cinematic flair.
Scene transitions	Define start and end compositions for precise A-to-B shots — useful for ads, trailers, or music videos.
Storyboard-to-video	Convert illustrated storyboard frames into rough-cut motion tests with matching audio.
Social content	Animate memes, portraits, or fan art into shareable clips with sound.
Virtual avatars	Animate a single headshot into a talking-head video with natural speech and lip-sync.

Key Features

Feature	Description
Start frame conditioning	Upload an image to set the opening composition, lighting, subject, and style.
End frame conditioning	Optionally upload a second image to define where the shot lands — the model generates the motion path between them.
Native audio generation	Dialogue, sound effects, and ambient audio rendered alongside the video. Lip movements stay locked to speech.
Cinematic camera work	Pan, tilt, zoom, dolly, orbit, tracking shots — describe the move in your prompt.
Character consistency	The subject from your start frame stays stable throughout — face, clothing, and expression.
High resolution	Output up to 1080p with smooth temporal consistency.

Controls

Parameter	Options	Notes
`prompt`	Text (required)	Describe action, dialogue, camera, and sound
`image_url`	URL (required)	Start frame — sets the opening composition
`end_image_url`	URL (optional)	End frame — defines the closing composition
`aspect_ratio`	`21:9` · `16:9` · `4:3` · `1:1` · `3:4` · `9:16`	Default: `16:9`
`resolution`	`480p` · `720p`	`480p` for faster iteration; `720p` for final output
`duration`	`4`–`12` seconds	Default: `5`
`generate_audio`	`true` / `false`	Default: `true` — set `false` for silent video
`camera_fixed`	`true` / `false`	Lock the camera in place (tripod shot)
`seed`	Integer	Set a value for reproducibility; use `-1` for random

Start Frame / End Frame

This is the core differentiator from text-to-video. You control the opening and closing compositions directly.

Frame	What it does
Start frame (`image_url`)	Required. Sets the initial subject, pose, lighting, color grade, and environment. The model animates forward from here.
End frame (`end_image_url`)	Optional. Defines the final composition. The model generates a motion path that lands precisely on this frame.

Tips:

Use the same subject in both frames for smooth transitions.
Match aspect ratio and style between start and end frames.
Motion is generated in latent space — not interpolated — so physics and camera movement feel natural.

Prompting Tips

Your prompt guides what happens between the frames:

Element	Example
Action	”She turns to face the camera and smiles”
Dialogue	`"I've been waiting for this moment."` (use quotes)
Camera	”Slow push-in ending on a close-up”
Audio/Foley	”Soft piano, room reverb, fabric rustling”

More tips:

The start frame already defines the scene — focus your prompt on motion and sound.
For talking heads, put the dialogue in quotes and describe the emotion: "I can't believe it," voice breaking with emotion.
Use camera_fixed: true if you want the subject to move but the frame to stay locked.

Specs

Spec	Value
Max duration	12 seconds
Max resolution	1080p
Audio	Mixed dialogue + foley + score, 48 kHz AAC
Output format	MP4 (H.264)

API

fal.ai → Seedance 1.5 Pro image-to-video

Bytedance — Video Generation

Limitations

aspect_ratio restricted to: 21:9, 16:9, 4:3, 1:1, 3:4, 9:16, auto
resolution restricted to: 480p, 720p, 1080p
Content moderation via safety checker

Video Generation

Image Generation

Audio

Vision

3D

Bytedance Seedance V1.5 Pro API

Try it in the Playground

Quick Start

Input Schema

Output Schema

Input Example

Output Example

Try it in the Playground

Quick Start

Input Schema

Output Schema

Input Example

Output Example

Use Cases

Key Features

Controls

Start Frame / End Frame

Prompting Tips

Specs

API

Limitations

Video Generation

Image Generation

Audio

Vision

3D

Try it in the Playground

​Quick Start

​Input Schema

​Output Schema

​Input Example

​Output Example

Try it in the Playground

​Quick Start

​Input Schema

​Output Schema

​Input Example

​Output Example

​Use Cases

​Key Features

​Controls

​Start Frame / End Frame

​Prompting Tips

​Specs

​API

​Related

​Limitations

Quick Start

Input Schema

Output Schema

Input Example

Output Example

Quick Start

Input Schema

Output Schema

Input Example

Output Example

Use Cases

Key Features

Controls

Start Frame / End Frame

Prompting Tips

Specs

API

Related

Limitations