Minimax H3 Recast

It is a cast replacement tool rather than a video generator. The portraits you upload take the place of the people already in your clip, while movement, framing, edits and audio are all carried over from the original.

Between 5 and 30 seconds, with each shot under 15 seconds. Split longer takes before you upload, because the result comes back the same length as the input.

Up to four, each with its own portrait. The tool maps them to the on-screen leads in screen order by default, so arrange your uploads accordingly; a written instruction can change the mapping.

One sharp, evenly lit, front-facing portrait per person. Half-body framing reproduces hair and clothing more faithfully than a tight head crop; avoid sunglasses, hats, hidden faces, group photos and heavily filtered or blurry images.

Preview first at low resolution to confirm the pairing, then render the deliverable at 1080p. Since cost scales with clip length, the cheap pass is the sensible way to catch a mismatch.

When the footage itself needs to change — different action, different camera work, a different setting — since all of that comes from your source clip. Results also suffer with dense crowds, distant or tiny faces, fast motion and objects covering the face after a hard cut. Across long takes, or when a performer turns to profile, the likeness can drift back toward the original actor.