Minimax H3 Recast

It is a cast substitution tool rather than a video generator. The portraits you supply take the place of the people already in your footage, and the movement, framing, edits and audio all carry over from the source unchanged.

Somewhere between 5 and 30 seconds, with no single shot running past 15 seconds. If your take is longer, break it apart before uploading — the finished file comes back the same length as the input.

You can recast up to four people, and each one needs a portrait of their own. The tool maps them to the leads in screen order by default, so line your uploads up accordingly; a written prompt can override that mapping.

One sharp, evenly lit, front-facing portrait per person works best. A half-body shot carries hairstyle and clothing more faithfully than a tight head crop, and you should avoid sunglasses, hats, hidden faces, group photos and anything blurry or heavily filtered.

Start with a low-resolution pass to confirm the pairing, then commit to 1080p for the deliverable. Since cost follows clip length, that first pass is the inexpensive way to spot a mismatch.

Yes — if the footage itself needs to change, such as different movement, different camera work or a new location, since all of that comes from your source clip. Results also degrade with dense crowds, distant or tiny faces, fast motion, and objects that cover a face right after a cut; across long takes or when someone turns to profile, the likeness can drift back toward the original performer.