Minimax H3 Recast

It is a replacement tool rather than a generator: the portraits you supply stand in for the performers in your existing video, while movement, framing, editing and audio carry over from the original.

Keep the clip between 5 and 30 seconds and each individual shot under 15 seconds; split longer takes before uploading, because the output comes back at the same duration you gave it.

Up to four, each with its own portrait. The default maps them to the leads in screen order, so arrange uploads accordingly; a written prompt can override that mapping.

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

Run the low-resolution pass first to confirm the pairing, then render the deliverable in 1080p. Since pricing follows clip length, that first pass is the inexpensive way to catch a mismatch.

Skip it when the footage itself has to change — different action, camera work or location — because all of that comes from your source. Results also weaken with dense crowds, very small or distant faces, fast motion, and objects crossing the face after a hard cut; on long takes or when someone turns to profile, the likeness can drift back toward the original performer.