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Gemini
Gemini Omni Flash is one of the fastest video models on OpenArt, and a lot of what makes it useful comes down to how you prompt it. Gemini Omni 1.2 Flash makes clips up to 15 seconds long, and it rewards a clear scene description and short, direct edits.
This guide covers what works and how to write the most effective prompts for Gemini Omni Flash, from the first draft to the 4K upscale.
Key takeaways
- Describe the whole scene: subject, action, setting, lighting, and camera.
- Say if you want one continuous shot, or Omni Flash may add its own cuts.
- Direct the audio, and plan what happens when across up to 15 seconds.
- Keep edit prompts short and add "keep everything else the same."
- Draft at 360p or 720p, then upscale only the clip you keep to 1080p or 4K.
Describe the whole scene
Simple prompts like "a cute dog running" give the model too little to work with. Describe the full shot instead: subject, action, setting, lighting, and camera move, like "A golden retriever sprinting along a beach at sunset, low tracking shot, warm backlight, soft slow motion." The more concrete detail you give, the less the model has to guess.
Choose one shot or many
By default, Gemini Omni Flash builds a short story from a few different shots, which is great for variety but not when you want one clean clip. When you need a single scene, say so directly: "in a single continuous shot" or "no scene cuts."
Direct the audio
Omni Flash generates sound along with your video, so treat audio as part of the prompt. Describe what you want, like "gentle breeze and distant birdsong," "an upbeat techno beat," or "no dialogue," and name music explicitly, since that is the audio people most want to control.
For voice lines, write the exact words and say who says them, like: the barista asks "Your usual?" and the customer laughs and says "You know me too well." Gemini Omni 1.2 Flash makes natural-sounding speech, matches the mouth to the words, and can give two speakers their own voices.
Keep edits simple and precise
Editing is where Omni Flash shines, and simple prompts work best, since overly detailed instructions can trigger changes you did not ask for. Describe one change at a time, like "make this video anime," and add "keep everything else the same" to hold the rest of the scene steady.
With Gemini Omni 1.2 Flash, the editor takes videos up to 15 seconds long, up from 10. Upload the clip in OpenArt's AI video editor, pick Gemini Omni 1.2 Flash, and type the change.
Guide with references
When you can show something, do not spend your prompt describing it. Add a reference image for a character, product, or style, and Omni Flash carries it across the clip, so you can save your prompt text for the action, layout, and mood a reference cannot convey.
Gemini Omni 1.2 Flash takes up to 10 reference images plus short reference video clips, and it follows them closely, so a product, a face, or a brand color stays the same from clip to clip. Add a start frame and an end frame when you want to control exactly how the clip opens and where it lands.
Time your events
You can direct when things happen in plain language, which is useful for rhythm and cuts: "after three seconds, she turns around" or "every two seconds, cut to a new location." Gemini Omni 1.2 Flash makes clips up to 15 seconds long, so you have room for three or four moments in one clip.
A simple timecode style works too, such as "[0-5s] walking through the market, [5-10s] stops at a fruit stall and looks up, [10-15s] starts running toward the camera." Clips made with a start and end frame, or with reference images and videos, run up to 10 seconds, so keep those timings inside 10.
Put on-screen text in quotes
On-screen text is a strength, so write the exact words in quotes and say where they appear, like a storefront sign that reads "NOW OPEN." Short, quoted text comes out far more cleanly than long lines, and English is the most reliable.
Draft, refine, then upscale on OpenArt
Omni Flash is fast and cheap at 360p and 720p, so treat the first clip as a draft: generate, then refine by chatting, like "warmer light," "slower pace," or "swap the jacket for red." Gemini Omni 1.2 Flash costs about 30% less than 1.1 Flash at every resolution, so you can afford a few more tries.
When a draft is right, upscale that one clip to 1080p or 4K in OpenArt's AI video upscaler with Gemini Omni 1.2 Flash. It takes any clip up to 15 seconds long, so you pay for high resolution only on the version you publish.
When a project needs more length or a different look, OpenArt's AI video generator lets you extend the clip or switch to Veo 3.1, Seedance 2.5, or Kling 4.0 in the same workspace.
4 sample prompts
Here is how these tips come together in practice.
Sample 1: Text to video with audio
A cozy ramen shop at night, steam rising from a fresh bowl, neon signs glowing outside the window. Slow push-in on the bowl, in a single continuous shot. Sound design: sizzling broth and soft city rain, no dialogue.
Shows a full scene, a named camera move, a single-shot instruction, and directed audio.
Sample 2: Image to video with a reference
Use the uploaded product photo as a reference. The sneaker rotates slowly on a matte studio pedestal, soft key light from the left, shallow depth of field. Keep the logo sharp and readable. Calm ambient background music.
Shows a reference handling appearance while the prompt handles motion, lighting, and audio.
Sample 3: Conversational edit
Remake this video in anime aesthetic. Keep everything else the same.
Shows a short, single-change edit that restyles the clip while preserving motion, camera position, and composition.
Sample 4: A 15-second clip with timed moments
A street food vendor flips noodles in a wok at a night market, single continuous shot, warm lantern light throughout. [0-5s] The camera starts wide on the stall, steam and sparks rising, crowd noise and sizzling. [5-10s] It pushes in slowly as the vendor plates the noodles and sprinkles green onion. [10-15s] It settles on a close-up of the finished bowl, with a hand-written sign behind it that reads "BEST NOODLES". No dialogue.
Shows timed moments across the full 15 seconds, a single-shot instruction, quoted on-screen text, and directed audio.
Final word
Describe the whole scene, choose one shot or many, direct the audio, and keep edits short and specific. Gemini Omni 1.2 Flash rewards clarity, and with 15-second clips, chat edits, and a standalone upscaler on OpenArt, you can carry a strong draft all the way to a 4K final.
When a project calls for a different model, Veo 3.1, Seedance 2.5, and Kling 4.0 sit in the same menu in the AI video generator.
Frequently asked questions: Gemini Omni Flash prompting
How detailed should a prompt be?
Detailed but focused. Cover subject, action, setting, lighting, camera, and audio, and let references handle appearance.
Why did my clip have multiple shots?
Omni Flash adds cuts by default. Add "single continuous shot" or "no scene cuts" for one clip with no cuts.
How do I get specific music?
Describe it, like "upbeat lo-fi beat." Without direction, the model chooses the audio for you.
How long can a Gemini Omni Flash clip be?
Gemini Omni 1.2 Flash makes clips from 3 to 15 seconds long from text or a starting image. Clips made with a start and end frame, or with reference images and videos, run up to 10 seconds.
Can I upscale a clip I already made?
Yes. In OpenArt's AI video upscaler, pick Gemini Omni 1.2 Flash, upload a clip up to 15 seconds long, and choose 1080p or 4K.
Do I need to prompt differently for Gemini Omni 1.2 Flash compared to 1.1 Flash?
No. The same rules apply. The main change is that you have up to 15 seconds to plan, so write timings for the whole clip.