Gemini Omni Flash video generator: clips that talk, inside a finished video
By Arsène Huot, founder of TubeTube · Published · Updated · model facts from Google's Omni documentation of 17 September 2026
What Gemini Omni Flash does that other engines don't
Most image-to-video engines render a silent clip. Hailuo 2.3, Seedance 2 and Kling 2.5/2.6 all work that way on TubeTube: the picture moves, and the pipeline mixes ElevenLabs narration or Suno music over it in the edit. Omni Flash renders the audio inside the clip itself. Write "Mira: I told you it would rain" in a dialogue-mode script and Mira says it, mouth moving, with the rain audible behind her. That makes it one of the three engines TubeTube offers in dialogue mode, next to Veo 3.1 (the 12 script languages TubeTube offers) and Kling 3 (English, Chinese, Spanish).
Where it sits against Veo 3.1, Google's other speaking engine on TubeTube: Omni Flash is 720p only, billed per second (18 credits, so 108 for 6 seconds) and keeps ambience in the shot on dialogue lines; Veo 3.1 goes to 1080p on fixed 4, 6 or 8 second scenes, and a 6 second Veo 3.1 Fast scene costs 89 credits, at 720p or 1080p. So Omni Flash is not the cheaper route: pick it for scene lengths Veo doesn't offer (5, 7, 9 or 10 seconds), and pick Veo 3.1 Fast for the lowest cost per spoken scene or for languages beyond English and French. The engine matrix is in Kling vs Veo vs Hailuo.
What Google supports, and what we verified ourselves
Google's Gemini API documentation for Omni, updated 17 September 2026, is explicit: English is fully supported, other languages have not been evaluated. We tested French lines on TubeTube and they came back word for word, so we list French as verified by us, not by Google. Anything else, test one scene first. The same page states that every Omni video carries SynthID, Google's watermark that is invisible to viewers but can be detected programmatically to verify the clip's provenance. TubeTube does not remove it.
What TubeTube does not expose (honest)
TubeTube calls the gemini-omni-1.1-flash model once per scene from your script. It does not offer the conversational editing that Omni 1.1 brings to Google's Gemini API and Flow ("make the sky darker"), does not extend a clip up to 40 seconds, and does not upscale to 1080p or 4K; Omni output here is 720p. To change a scene you edit its prompt and regenerate that scene alone. If chat-driven editing of a single clip is what you want, Google's own tools are the right choice; if you want a scripted multi-scene video where characters talk, that is this page.
How TubeTube uses Omni Flash in a full video
Omni Flash is a stage, not the whole pipeline. TubeTube writes or takes your script, assigns a described voice to each character, storyboards the text into scenes of 4 to 10 seconds (6 minimum when someone speaks, because a line needs about 10 characters per second), generates one consistent image per scene with the previous scenes as context, renders each scene with Omni Flash, keeping its native audio on the shots where a character speaks (narrator and silent shots get their sound in the edit), then edits the clips into one synchronized video with an optional music bed and, in 16:9, a YouTube thumbnail. Every step is visible live and every scene can be regenerated on its own.
What Gemini Omni Flash costs on TubeTube
Omni Flash is billed per second of generated video, at 18 credits a second, so you pay for the exact scene length you pick rather than a fixed tier. At the base rate of $0.011 per credit:
| Scene length | Credits | Approx. USD (base rate) |
|---|---|---|
| 4 s | 72 | $0.79 |
| 6 s | 108 | $1.19 |
| 8 s | 144 | $1.58 |
| 10 s | 180 | $1.98 |
Larger plans lower the per-credit price (Creator, Studio and Agency plans at $49, $129 and $399 a month price credits 10 to 30% below the base rate). For scale, a 6 second Veo 3.1 Fast scene is 89 credits and Kling 3 is 14 credits per second at 1080p. The live quote itemizes every scene before you launch, and credits reserved for scenes that are not produced are refunded automatically.
When to pick Omni Flash, and when not to
Pick it when characters must speak on camera in English or French, when the format is a 9:16 Short where 720p is usually enough, and when you want per-second billing on scenes of odd lengths. Pick Veo 3.1 instead when you need 1080p, a lower cost per spoken scene (Veo 3.1 Fast), or dialogue in one of the other languages TubeTube's dialogue mode offers. When nobody speaks, Hailuo 2.3 (23 credits for 6 seconds), Kling 2.6 Pro (34 for 5 seconds) or Kling 3 (14 per second) cost less than Omni Flash, and narration is added in the edit anyway. The full engine comparison, with resolution and motion notes, is in Kling vs Veo vs Hailuo; the Sora migration angle is in Sora is shut down.
Methodology
Model facts (native audio, 720p, SynthID, English fully supported, other languages not evaluated, Omni 1.1 features such as conversational editing and 40 second extension) come from Google's Gemini API documentation for Omni, last updated 17 September 2026, and Google's I/O 2026 announcement. TubeTube figures (18 credits per second, 4 to 10 second scenes, 6 second floor in dialogue, 14 engines, $0.011 per credit at the base rate, and the per-scene credits of the other engines) come from its pricing table and engine catalogue on 23 September 2026. The French verification is our own test, not a Google statement. Google changes model names, limits and availability often; re-check its documentation before committing a production workflow.
Real examples: gemini omni flash made with TubeTube
Finished videos from the community gallery, each with its full recipe (style, engine, voice, lyrics or script) that you can remix with your own words.
Frequently asked questions
What is Gemini Omni Flash?
Gemini Omni Flash is the first model in Google's Gemini Omni family, announced at Google I/O on 19 May 2026. It generates a video and its audio (speech, ambient sound, music) in the same pass, from text, images, audio or video as input, at 720p. On TubeTube it is one of 14 selectable video engines: each scene of your script is rendered by Omni Flash as a 4 to 10 second clip, then the clips are edited into one finished video. In dialogue mode, the shots where a character speaks keep the sound Omni generates; narrator and silent shots, like every scene in narration or song mode, are rendered without it, and the narration or music is added in the edit.
Does Gemini Omni Flash generate audio and dialogue?
Yes. Unlike Hailuo 2.3, Seedance 2 or Kling 2.5/2.6, which render silent clips that get music or narration mixed over them in the edit, Omni Flash renders the sound inside the clip: a character can say a line on camera, with ambient sound behind it. That is why TubeTube's dialogue mode offers it, alongside Veo 3.1 and, for English, Chinese and Spanish, Kling 3. TubeTube keeps that sound only on the shots where a character speaks in dialogue mode; in narration or song mode the clip's own audio is removed.
Which languages does Gemini Omni Flash speak?
Google's Gemini API documentation for Omni (updated 17 September 2026) states that English is fully supported and that other languages have not been evaluated. In our own tests, French lines were rendered word for word. Other languages may work but carry no guarantee from Google, so test one scene before committing a whole video, and prefer Veo 3.1, which TubeTube's dialogue mode offers in 12 script languages, if your dialogue is not in English or French.
How long can a Gemini Omni Flash clip be?
On TubeTube, 4 to 10 seconds per scene, chosen freely with a slider and billed per second. In dialogue mode the minimum is 6 seconds, because a spoken line needs room (about 10 characters per second). A finished video is as long as your script: TubeTube splits it into scenes, renders each one and edits them together, so a 3 minute talking video is roughly 18 to 30 Omni Flash scenes of 6 to 10 seconds, not one clip.
How much does Gemini Omni Flash cost on TubeTube?
18 credits per second of generated video, about $0.20 at the base rate of $0.011 per credit: a 6 second scene is 108 credits ($1.19), a 10 second scene 180 credits ($1.98). For comparison, a 6 second Veo 3.1 Fast scene, which also speaks in dialogue mode, is 89 credits, and Kling 3 is 14 credits per second at 1080p (it speaks in English, Chinese and Spanish only). The exact quote for a whole video is shown before you launch, and credits reserved for scenes that are not produced are refunded.
Can I edit a Gemini Omni Flash video by chatting with it?
Not on TubeTube. Conversational editing, extending a clip up to 40 seconds and upscaling to 1080p or 4K are features of Gemini Omni 1.1 Flash in Google's Gemini API (Interactions API) and Google Flow; scene extension is also in the Gemini app. TubeTube calls the Omni Flash model once per scene from your script; you change a scene by editing its prompt and regenerating it, not by chatting.
Are Gemini Omni Flash videos watermarked?
Every video generated by Gemini Omni carries Google's SynthID, a watermark that is invisible to viewers but can be detected programmatically to verify the clip's provenance; TubeTube does not remove it. Separately, TubeTube's own visible tubetube.io mark applies only to downloads made on the free signup credits and disappears on any paid plan.