Seedance 2.5

Overview

The Seedance 2.5 image-to-video pipeline is aimed at developers who need precise control over the visuals: it starts from a first-frame image, optionally constrains the ending with a last-frame image, and uses a prompt to describe motion, camera work, and scene, producing a coherent video of 4 to 30 seconds. While generating the visuals, the model also produces synchronized dialogue, sound effects, and ambient audio, and it supports 720p and 1080p output in both mp4 and mov containers. It is suited to teams that already have still-image assets and need to extend them into short videos — product showcases, previsualization of ad shots, and serialized content production.

Key Highlights

• Two-way shot constraint via first and last frames — supply a first frame and optionally specify a last frame, so both the start and end of the generated video land on existing assets, reducing repeated regeneration.
• Visuals and audio generated in one pass — dialogue, sound effects, and background audio are produced in sync by default, with no separate dubbing and alignment step.
• Prompts supported in eleven languages — motion, camera, scene, and audio instructions can be written in multiple languages, making collaboration across multilingual teams easier.
• Selectable resolution and container — 720p and 1080p, mp4 and mov are supported; mov makes it easy to move into professional post-production workflows.

Capabilities

First-frame-driven video generation: generates video starting from a first-frame image in formats such as jpeg, png, and webp; the aspect ratio follows the first frame automatically, making it well suited to extending finalized stills.

Last-frame endpoint control: a last-frame image can be added to constrain the video's ending frame; when aspect ratios differ, it is center-cropped to match the first frame, which helps with shots that need to converge on a fixed endpoint.

Synchronized audio generation: by default, dialogue, sound effects, and background audio synchronized with the visuals are generated; this can be turned off to obtain clean visual footage for post-processing.

Duration and quality parameters: duration is set as an integer from 4 to 30 seconds and billed by the requested duration; resolution is chosen between 720p and 1080p, and output is mp4 or mov.

Web-grounded information completion: web retrieval can be enabled so that time-sensitive information referenced in the prompt is taken into account during generation.

Use Cases

• E-commerce and product teams: product hero stills — generate a short showcase video from a product still as the first frame, with visuals and audio produced in sync and ready for product pages or ad placements.
• Advertising creative teams: storyboard key frames — expand key frames from a storyboard into clips with camera movement and sound effects, for pitch presentations and pre-shoot previsualization.
• Brand content operations: finalized character and scene images — extend finalized character or scene images into a series of short videos, keeping the look consistent and producing social content at scale.
• Post-production: first/last-frame shot completion — generate the in-between motion from given start and end frames, for bridging footage or filling in transition shots.

Limitations and Selection Advice

A single generated clip is capped at 30 seconds; longer content must be split into multiple segments generated separately. Physical plausibility of complex actions and the stability of multi-subject interactions remain known weaknesses; for shots with large motion ranges or many characters, validate with a small sample first. When both a first frame and a last frame are supplied, reference images or reference audio cannot be added; if multiple reference constraints are needed, switch to the reference-to-video pipeline. For lightweight, single-shot needs with low controllability requirements, a simpler text-to-video pipeline may be the better choice.