BLACKFORESTLABS FLUX 3 Extend Video
Extend a video, continuing from the source clip final frames, using FLUX 3.
What it does
BLACKFORESTLABS FLUX 3 Extend Video, in practice.
FLUX 3 Extend Video continues an existing video clip from where it left off. Provide a source video and a prompt describing how the action continues, and the model generates a seamless new segment that flows naturally from the final frames — with optional native audio.
- Seamless continuation The model reads the source clip's final frames and continues the motion naturally.
- Native audio generation Produce the extension and its synchronized audio in a single request.
- Explicit duration required Duration must be set explicitly to validate keyframe positions.
- Flexible aspect ratios `auto`, `21:9`, `2:1`, `16:9`, `4:3`, `1:1`, `3:4`, or `9:16`.
- High resolution output Generate the extension in 720p or 1080p.
Product photo workspace
This page is a model reference. The workspace supports white backgrounds, scene changes, packaging text edits and model try-on using Qwen Image Edit.
Parameters
What you can set.
| Parameter | What it does | Options |
|---|---|---|
prompt | Text description of how the video continues from the source clip's final frames. | |
video_url | URL of the input video to extend. MP4, under 50 MB and under 15 seconds. | |
aspect_ratio | Aspect ratio of the generated video. auto lets the model choose. | auto 21:9 2:1 16:9 4:3 1:1 3:4 9:16 |
resolution | Resolution of the generated video. | 720p 1080p |
duration | Duration of the generated video in seconds. An explicit duration is required to place the end frame. | 5 6 7 8 9 10 11 12 13 14 15 16 |
generate_audio | Whether to generate audio for the video. | default True |
safety_tolerance | Safety tolerance level. 0 is the strictest and 4 is the most permissive. | default 2 |
seed | Random seed for reproducibility. |
Sample prompt
The prompt behind the sample.
Clouds slowly cover the character.
aspect_ratio: 9:16resolution: 720pduration: 5generate_audio: Truesafety_tolerance: 2FAQ
Short answers.
How much does BLACKFORESTLABS FLUX 3 Extend Video cost?
List price starts at $0.61 per second of video at the base resolution; higher resolutions and longer durations cost more. An 8-second clip at the base tier is about $4.92. Per-use pricing, no subscription. Model prices are reference prices. The prompt workspace is free during the period shown on the homepage; no automatic charges.
What content policy applies to BLACKFORESTLABS FLUX 3 Extend Video?
Black Forest Labs's standard content policy, plus this site's commercial-use rules: product, catalog and marketing work. Uploads are processed for your request only and are not used for training.
What does BLACKFORESTLABS FLUX 3 Extend Video take as input?
It is a text-to-video model. Extend a video, continuing from the source clip final frames, using FLUX 3.
How do I use BLACKFORESTLABS FLUX 3 Extend Video?
Write the shot the way you would brief a DP — subject, place, light, lens, one motion, ratio — then run it. Expect a clip with native audio in the seconds range. Iterate one variable per pass; rewrites of the whole prompt are what make motion drift. Register or sign in to edit product photos with Qwen Image Edit. Other models on this page are catalog references.
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