How to Use FLUX 3 AI Video Generator: Practical Guide

To use the FLUX 3 AI video generator, first protect the part of the shot that cannot drift: a scene idea, approved opening frame, key transition, or existing clip. Then direct one action, one camera move, and one sound cue. This guide is for short social, product, and character clips—not for replacing an edit with one prompt.

FLUX 3 Video is Black Forest Labs’ public video-generation release. It supports text-to-video, image/keyframe input, and continuation with synchronized speech, effects, and ambience. It remains a preview product as of September 1, 2026, so confirm limits in the official FLUX 3 documentation before a production run.

Choose the FLUX 3 input mode before writing the prompt

Choose the mode by deciding what must survive the generation: a written idea, an approved still, a planned handoff, or the final frame of a source clip.

Starting point	Use this mode	Best fit
A scene that only exists as a brief	Text-to-video	New concepts, B-roll, short social hooks
One approved still image	Image-to-video	Product shots, character portraits, opening-frame control
Several compositions the shot must reach	Image-to-video with keyframes	Reveals, before-and-after transitions, storyboarded motion
A short existing clip that needs another beat	Video continuation	Extending motion, framing, dialogue, or ambience

The FLUX video prompting guide confirms that source images become clip frames, while ordered keyframes pin defined moments. Use image-to-video only when the source frame matters; for a fresh written concept, text to video is the cleaner starting point.

Set a small, testable video brief

Set the delivery format first: a 9:16 hook, 16:9 loop, product reveal, or continuation. Text-to-video and image-to-video currently run from 5 to 20 seconds; continuation runs from 5 to 15 seconds. A five-second clip has room for only two or three readable beats, so give it one pass/fail condition such as a legible label, a finished line of dialogue, or a camera move that survives the seam.

Before a model-specific run, an ai video generator can help teams pressure-test the brief, motion, and framing with short creative drafts.

Write FLUX 3 Video Prompts as directions for a moving shot

Treat the prompt as a shot direction, not a list of objects: camera + subject + action + environment, then only the lighting or sound that matters. The text-to-video prompt guide recommends short prompts for exploration and more structure only when the shot needs more control. Reuse the same subject description across related shots.

A text-to-video prompt for a social hook

Video prompt: A vertical close-up of a baker lifting warm rosemary focaccia from a stone oven and setting it on a wooden board. One slow push-in from chest height to the crust; morning window light, oven crackle, and a soft ceramic tap. End with the bread centered in frame.

A product still to image-to-video prompt

For image to video, let the source image establish the product and composition; direct only what happens next.

Video prompt: Use the supplied matte-green travel mug photo as the opening frame. Make one restrained 20-degree turn, then settle in the original centered position. Preserve the mug shape, lid, logo placement, backdrop, and left-side light. Slow macro push-in, a subtle ceramic click, no new props or on-screen text.

Direct audio as part of the scene

FLUX 3 generates audio with the frames. When sound matters, name a cause and effect: a ceramic tap as a mug settles, rain against a window, or a line that must finish before the cut. For dialogue, name the speaker, quote the exact words, and state whether it is on camera or voiceover.

Use Draft mode to decide, then enhance the take

Use Draft mode to compare one variable at a time: camera move, product motion, dialogue pace, or a keyframe transition. The current documentation says Draft Enhance renders the chosen preview at full quality from its saved draft data, rather than creating a fresh interpretation. Enhance only after the take passes the check that matters.

Use keyframes and continuation for the right kind of control

Use keyframes when a shot must pass through defined compositions: one image opens the clip, two define a start and end, and more frames form a short storyboard. Use continuation instead when an existing clip’s momentum, framing, and sound must carry into the next beat. Keep every transition physically plausible and test the seam before building a longer edit around it.

Review the clip as an editor, not only as a prompt writer

Play the full clip with sound on, then scrub the frames where the risk lives: product geometry, hand contact, dialogue timing, cut continuity, or text at delivery size. If a take fails, change the relevant control—source image, keyframe, timeline, or camera direction—rather than rewriting everything. The technical FLUX 3 Video review explains the focused pilot checks in more detail.

How to Use FLUX 3 AI Video Generator in a Production Loop

Choose the input that protects the shot, direct one action and camera move, make a Draft, enhance the take that passes its check, then edit from approved clips. FLUX 3 works best as a sequence of short, reviewable decisions—not as one overloaded prompt.

FLUX 3 FAQ

How do I use FLUX 3?

Choose the input that matches the asset you need to protect: text for a new scene, an image or keyframes for composition control, or a source clip for continuation. Write a short direction for motion, camera, and sound, create a Draft, then enhance and inspect the winning take.

Which FLUX 3 mode should I use?

Use text-to-video when the scene can begin from words. Use image-to-video when the opening frame matters. Use timed keyframes when a shot must pass through defined compositions, and video continuation when movement, framing, and audio need to carry on from an existing clip.

How long can a FLUX 3 Video clip be?

According to Black Forest Labs’ current documentation, text-to-video and image-to-video output can be 5 to 20 seconds long. Video continuation runs from 5 to 15 seconds. All modes output at 24 fps in HD or Full HD, subject to the selected settings and current product limits.

Should I use FLUX 3 Draft mode first?

Yes, when you are still choosing a creative direction. Drafts provide a faster, lower-cost preview. After selecting a take, Draft Enhance uses the saved draft data to render the same shot at full quality, rather than asking the model to interpret a fresh generation request.