Separate video generation from sprite delivery

Begin with a rights-cleared source clip and a dated record of how it was made. Keep the exact prompt, authorized references, visible model path, output file, and selection notes together. The checked MiniMax repository documents H3 as an audio-video generation system and lists games as a scenario; it does not document a sprite extractor, transparent-frame exporter, animation-state classifier, or atlas packer. Treat every frame as candidate source material rather than a finished game asset, and verify current SEELE access before assuming any H3 input or output control is available.

• Source clip and generation record
• Rights and identity status
• Declared animation state
• Target engine and delivery contract

Select frames around the animation state

Define the action before sampling: idle, walk, attack, hit response, effect, or transition. Record facing direction, intended loop, target frame rate, frame budget, silhouette, contact points, and the moment that must read most clearly. Inspect the clip frame by frame instead of taking equally spaced stills automatically. Remove blurred transitions, duplicate poses, camera drift, broken anatomy, changing costume details, moving light that will flicker, and frames whose perspective cannot share one game plane. Preserve the original timecode beside each accepted frame so the selection can be traced and revised.

Normalize, pack, and inspect in the engine

Choose one canvas, scale rule, ground line, pivot, transparent-edge treatment, naming convention, and row order. Clean backgrounds without erasing required silhouettes, then compare adjacent frames for size jumps, color shifts, edge halos, prop changes, foot sliding, and accidental camera movement. Pack the atlas with explicit cell dimensions, padding, frame identifiers, playback order, and loop markers; export metadata in the format the receiving engine actually accepts. Test nearest and filtered sampling at representative zoom levels. The successful deliverable is a traceable atlas that passes the declared checks, not proof that H3 natively produced game-ready sprites.