Minimax H3 Max Recast.

Minimax H3 Max Recast Overview

Minimax H3 Max Recast transforms video with reference photos to replace people while preserving motion, camera work, cuts, and audio for creative video editing.

A video and reference photographs guide replacement of visible people in the source clip.

Minimax H3 Max Recast from MiniMax is available through each::labs in the minimax-h3-max family. Required fields are video_url, reference_image_urls.

prompt: Optional: who becomes whom, or what else to keep or change. resolution: Resolution.

Use the Minimax H3 Max Recast API when you need this transformation or analysis as a repeatable step in an application or creative pipeline. The sections below distinguish the required material, adjustable controls and checks that matter before delivery.

Capabilities

• A video and reference photographs guide replacement of visible people in the source clip.
• prompt: Optional: who becomes whom, or what else to keep or change.
• resolution: Resolution.
• video_url: The source video, 5 to 30 seconds long, with no single shot longer than 15 seconds.
• reference_image_urls: One photo per new person.

Use Cases for Minimax H3 Max Recast

Minimax H3 Max Recast is useful when this specific operation fits between source preparation and delivery. These scenarios show how it can support different parts of a working pipeline.

Creators

Explore a character recast. Use a representative source or a concise brief, then inspect the result before preparing a larger set of assets.

Design and marketing teams

Preview a reference-guided performance. Compare the result with the intended message, composition and destination. Keep reviewable versions of the source and output.

Developers

Create a personalized version of an existing creative clip. Inspect the actual returned value before connecting it to another step, and keep the chosen request settings with the result.

Start with a clear definition of the desired result and use the exposed controls to reach it. Keep any additional generation, editing or application logic in separate steps so that the effect of this operation remains easy to review.

Tips and Tricks

Describe one coherent shot before adding complex action. State the subject, movement, camera behavior and setting separately. For reference-guided requests, choose source images with clear subjects and compatible framing.

• resolution: Resolution.

• Example direction: “A slow camera push toward the subject; one gentle movement, consistent lighting, no scene cut.”
• Example direction: “The subject turns slightly toward the camera while the background remains still.”

Compare one deliberate adjustment at a time. Inspect the part of the result affected by that change, then check the rest of the asset or response for unwanted side effects before reusing the settings.

Technical Specifications

• Result type: video.
• Required fields: video_url, reference_image_urls.
• resolution: string; options 768P, 1080P; default "1080P".
• prompt: string or null.
• seed: integer or null; minimum 0.

video_url: The source video, 5 to 30 seconds long, with no single shot longer than 15 seconds.

Values must use the types and accepted options listed in the parameter reference. A displayed default does not remove a required-field requirement. Choose a supported output setting for this entry rather than borrowing a preset from a related model.

Things to Be Aware Of

Watch the entire clip rather than reviewing only a thumbnail. Check subject identity, object boundaries, motion continuity, camera changes and the ending; review the audio as well when the entry includes it.

Optional settings are not necessarily interchangeable with those on another entry in the same family. Use the accepted names, types and values shown for this operation.

For media-based inputs, supply a directly retrievable file URL rather than a page containing the asset. Keep the source available while processing. Check the final content in the destination player, editor or application, not only the request status.

Key Considerations

Review identity through cuts and occlusions and verify that the retained motion and soundtrack match the intended use.

Public estimate: $0.3–$0.45 per second.

Prepare video_url, reference_image_urls before starting. Optional settings include prompt, resolution. Keep these settings aligned with the intended delivery, especially when a later step expects a particular type or format.

Run a representative request before scaling to a larger collection. Judge the result against the source and the brief, and account for all generated outputs or usage-sensitive options when estimating a batch.

Limitations

• reference_image_urls: minimum items: 1; maximum items: 4; item string; item minimum characters: 1; item format: uri.
• prompt: maximum characters: 2000.

Unsupported parameters do not establish additional capabilities. A generated result can differ from the intended brief, so review detail and consistency before publication.