Minimax H3 Recast

Minimax H3 Recast is a cast substitution, not a video generator: portraits you upload stand in for the people already in your footage, and everything else — movement, framing, edits, audio — is preserved from the original.

Your clip needs to sit in the 5–30 second range, with each individual shot under 15 seconds; cut longer takes apart before uploading, since the result comes back at the same length you gave it.

Four people maximum, each needing its own portrait. By default the tool assigns them to the leads in screen order, so arrange your uploads to match; a written instruction can change that assignment.

Choose a single crisp, well-lit, forward-facing portrait for each person. Half-body framing transfers hair and garments more faithfully than a close crop of the head; leave out sunglasses, hats, obscured faces, group shots and heavily filtered or blurry images.

Do a low-resolution pass first to verify the pairing, then produce the deliverable in 1080p. Because pricing tracks clip length, that first pass is the inexpensive way to catch a bad match.

It is the wrong tool when the footage itself has to change — different movement, different camera work, a different location — because those come entirely from your source. Results also weaken with dense crowds, faces that are tiny or far away, rapid movement, and objects blocking the face after a hard cut; over long takes or when someone turns to profile, the likeness may slip back toward the original performer.