For product ads needing one continuous take longer than eight seconds, this site lists Seedance 2.5 outputs of 4–30 seconds. Google’s Veo 3.1 documentation lists 4, 6, or 8 seconds per generation. Choose by shot length, input needs, and current access; published specifications alone do not establish which produces the better-looking ad.
Updated: November 11, 2026
How do the published length and output sizes compare?
Seedance 2.5 is listed on this site’s product page at 4–30 seconds per generation, with 480p, 720p, or 1080p output. Google’s current Veo 3.1 model page lists 4, 6, or 8 seconds per generation. The table compares selected delivery sizes rather than every output option; consult the linked Google specification for the full list.
| Published item | Seedance 2.5 on this site | Veo 3.1 in Google Cloud docs |
|---|---|---|
| Length in one generation | 4–30 seconds | 4, 6, or 8 seconds; a reference-image-to-video job is listed as 8 seconds only |
| Selected delivery sizes | 480p, 720p, or 1080p in this site’s configuration | 720p and 1080p are among the listed outputs; see Google’s full specification |
| Aspect ratios | 16:9, 9:16, 1:1, 4:3, 3:4, and 21:9 | 16:9 and 9:16 |
| Output format | Confirm the live generator and download | video/mp4 is listed |
| Main generation modes | Text, images, video, and audio references; text-to-video and image-to-video are described on the product page | Text to video, image to video, first and last frame, and reference or asset images are listed as supported |
Last verified: November 11, 2026, against the Seedance 2.5 product page on this site and Google’s Veo 3.1 model documentation on the Gemini Enterprise Agent Platform. Public pages can change; confirm the live sources before you generate a paid ad.
Where is Veo 3.1 still documented after the Gemini API preview shutdown?
Google’s Gemini API video documentation states that the Veo 3.1 Preview was shut down on October 22, 2026, and tells developers to move to Gemini Omni Flash or to the generally available Veo 3.1 models on the Gemini Enterprise Agent Platform.
The shutdown note names preview IDs beginning with veo-3.1-generate-preview and veo-3.1-fast-generate-preview, and a third preview ID listed on the same page. That is a Gemini API preview status, not a claim that every Google surface removed Veo 3.1. The Cloud model page for Veo 3.1 still lists veo-3.1-generate-001 as generally available, with a release date of November 17, 2025, and documents the 4, 6, or 8 second lengths cited above.
If your team only has Gemini API access, do not assume the shut-down preview IDs still run. If your team uses the Cloud platform named in Google’s migration note, use the live Veo 3.1 model page for current length, size, and input rules. This article does not compare Seedance 2.5 with Gemini Omni Flash; that is a different model family.
How do reference images and other inputs compare for product shots?
This site’s product comparison lists up to 50 reference assets for its Seedance 2.5 configuration: 30 images, 10 videos, and 10 audio files.
Those asset types can matter when an ad brief combines a pack shot, a logo reference, a motion reference, and a voice or music bed. The listed allowance is an upload limit, not a guarantee that every asset will be reproduced accurately. The same page also describes precise local edits without regenerating the entire video, and it lists video edit and extend modes as available for Seedance 2.5. Those are product-page statements, not measured success rates.
Google’s Veo 3.1 model page lists text-to-video, image-to-video, first-and-last-frame generation, and reference or asset images as supported. It also states that a reference-image-to-video job supports 8 seconds only, and it lists a 20 MB maximum input image size for image-to-video. Those constraints are relevant when a product ad is built from stills rather than from text alone.
For a longer single-take product demonstration, this site also publishes a length-focused guide, Seedance 2.5 video length guide. For rotating a physical product in frame, see Seedance 2.5 product rotation. Neither page is a substitute for the live generator settings.
How is sound handled in a product ad?
This site describes Seedance 2.5 as an audiovisual generation model and lists audio among the reference materials you can include.
The product page does not publish a separate, numbered limit for dialogue always being present or music always being absent. Treat audio as a setting and a reference type to confirm in the live creator: whether you are attaching an audio reference, asking the prompt to describe sound, or exporting a silent picture and adding sound later. Do not assume a result from a prompt alone.
Google’s Veo 3.1 model page lists sound generation as supported. It does not, in the specification block checked today, spell out a per-shot dialogue script format or a guarantee that every product-ad take will include usable speech. If synchronized speech or sound design is a requirement, confirm the live Cloud documentation and the actual output before you book an ad slot.
Sound support does not establish how natural the final audio will sound. Review the actual dialogue, effects, and music before deciding whether the clip is suitable for a paid placement.
Which option fits which product-ad job?
Use the published length first: if the ad must be one continuous take longer than 8 seconds, this site’s Seedance 2.5 configuration has the longer published initial-generation range at 4–30 seconds.
A 15- or 30-second product demo, an unbroken pack-to-pour sequence, or a single-take explainer that has to show several beats in one clip falls on that side of the documented limit. A 6- or 8-second bumper, bumper-plus-end-card, or short social cut may fit Veo 3.1’s documented 4, 6, or 8 second lengths if you still have access to the generally available Cloud model.
Input needs come next. If the brief depends on many stills, motion references, or audio references in one job, this site’s “up to 50 reference materials” statement is the documented ceiling to check. If the brief is a single product still, or a first and last frame, Google’s Veo 3.1 page lists those modes; remember the 8-second cap on reference-image-to-video.
Access is a third gate. A model that is documented but shut down on the API you actually use is not a practical choice for the next delivery. Verify Gemini API versus Cloud access before you storyboard around Veo 3.1. Likewise, confirm Seedance 2.5 duration, size, and credit estimates in the live generator on this site; a comparison table is not a checkout quote.
If the decision extends beyond these two models, the Seedance 2.5 alternatives guide provides a broader starting list. Keep the same delivery brief when comparing options: a short bumper and a continuous demonstration solve different production problems.
What should you confirm before you generate a product ad?
Confirm the live product page and the generator’s duration, size, and credit estimate immediately before you submit, because public wording and plan cards can change.
On this site, start from the Seedance 2.5 product page, set the length and size you actually need, and read the on-screen credit estimate. Compare the estimate for the actual duration and inputs you intend to use, rather than a different example shot. Read the estimate again before an edit or extension; an initial-generation allowance should not be treated as a quote for subsequent work.
On the Google side, open the current Veo 3.1 model page and, if you had been calling the Gemini API preview IDs, read the October 22, 2026 shutdown note. Confirm region, aspect ratio, length, and input limits for the exact model ID you will call.
For commercial use of Seedance 2.5 outputs, the product page tells you to check whether your plan includes a commercial-use license and to review the Terms of Service. This article does not add license interpretations beyond that published instruction.
What else should you know before choosing a model for product ads?
Separate first-generation limits from later editing, and distinguish documented access from a quality comparison.
Can Seedance 2.5 make a 30-second product ad in one generation?
This site’s product page says the full Seedance 2.5 model supports 4–30 second outputs. Thirty seconds is the published maximum for one generation, not a promise about quality or about every plan card.
Can Veo 3.1 make a 30-second product ad in one generation?
The Veo 3.1 model page checked today lists 4, 6, or 8 seconds per generation. A 30-second single generation is not in that specification block. Some workflows extend a clip after the first generation; that is a separate, documented feature to confirm on Google’s live pages, not a 30-second first take.
Is Veo 3.1 still available?
The Gemini API documentation says the Veo 3.1 Preview was shut down on October 22, 2026. Google’s Cloud model page still lists a generally available Veo 3.1 model ID. Availability depends on which Google surface you use; check both sources and your own account access.
Which model is better for a product still as the starting frame?
Both sides document image-to-video: this site lists image references within a 50-asset allowance, while Veo 3.1 documents reference-image-to-video at 8 seconds. Use those input rules to shortlist a workflow, then review a representative result before committing a campaign.
Does this article include a side-by-side viewing test?
No. This is a specification-based comparison, not a viewing test; it does not establish a winner for image quality, sound quality, generation speed, or reliability.
What sources support this guide?
The site’s product page supplies integration settings; Google’s documentation supplies Veo model specifications and API status. These are different kinds of evidence, not a claim of identical access across providers.
- Seedance 2.5 product page on this site, already linked above (November 11, 2026): up to 30 seconds in one pass; 4–30 second outputs at 480p, 720p, or 1080p; aspect ratios 16:9, 9:16, 1:1, 4:3, 3:4, and 21:9; up to 50 reference assets (30 images, 10 videos, and 10 audio files); precise local edits without regenerating the entire video; video edit and extend modes listed as available; commercial use depends on plan terms.
- Google Gemini API video documentation (November 11, 2026): Veo 3.1 Preview IDs in the Gemini API were shut down on October 22, 2026; the page points to Gemini Omni Flash or generally available models on the Gemini Enterprise Agent Platform.
- Google Cloud Veo 3.1 model page (November 11, 2026): video lengths 4, 6, or 8 seconds; reference-image-to-video listed as 8 seconds only; aspect ratios 16:9 and 9:16; output sizes including 720p and 1080p; 24 FPS; video/mp4; sound generation supported; text-to-video, image-to-video, first and last frame, and reference or asset images listed as supported.
Ready to put the plan into practice? Try Seedance 2.5, review the available settings and estimated credits, and start with a focused brief.
Seedance2Video Editorial Team. Independent website, not affiliated with ByteDance.