两人唱歌片段换角 · 骷髅面罩特种兵和灰绿外星人
30 秒真人换装短片，怎么做出来的？

PROMPT HEADER:
Edit the uploaded source video by replacing the two original performers with the two supplied original character references while preserving the source video as the only motion, performance, camera, editing, environment, and audio master.
SOURCE VIDEO AND REFERENCE ROLES:
Use @your-video as the sole editing master. Do not reinterpret, redesign, restage, extend, shorten, or replace the source performance. Use @character-a only as the global appearance reference for Character A, corresponding to the performer who starts on the left side of the original frame. Use @character-b only as the global appearance reference for Character B, corresponding to the performer who starts on the right side of the original frame.
The two PNG reference images are appearance references only. They are not first frames, last frames, keyframes, location references, lighting references, background plates, storyboard panels, or split-screen layouts. Do not show the reference images inside the edited video.
CHARACTER MAPPING AND IDENTITY:
Replace the original left performer with Character A from @character-a. Preserve Character A’s recognizable skull-style face covering, helmet, dark tactical clothing, equipment layout, colors, materials, and overall silhouette as shown in the reference image. Replace the original right performer with Character B from @character-b. Preserve Character B’s recognizable pale gray-green humanoid appearance, elongated head and body proportions, surface texture, eye design, colors, and overall silhouette as shown in the reference image.
Maintain exactly two performers throughout the full video. Keep Character A and Character B as separate identities with stable appearance, clothing or surface structure, masks or facial coverings, helmets or head shapes, colors, materials, proportions, and accessories. Do not exchange identities when they cross the frame. Track each character by the original performer’s motion path, body position, depth relationship, and temporal identity rather than by screen-left or screen-right position after the opening frame.
PERFORMANCE PRESERVATION:
Preserve the original singing performance from the source video. Match the original performers’ head orientation, torso movement, shoulder and chest rhythm, hand gestures, arm timing, stance, sway, and interaction timing. The replacement characters should appear to perform the same song through body language and the exact original audio timing, without inventing new choreography or extra gestures.
Because the characters’ mouths and noses are covered or otherwise not human-readable, do not generate exposed human faces, visible human lips, realistic mouth shapes, or lip movements that conflict with the references. Express singing through head direction, subtle nods, shoulder and chest breathing, body rhythm, hand gestures, posture, and the original performance timing. Keep the replacement motion synchronized to the existing singing audio without generating new dialogue or changing the vocal track.
CAMERA, EDITING, AND SPATIAL CONTINUITY:
Preserve every original camera cut, shot size, framing, lens perspective, camera movement, zoom, pan, tilt, tracking move, depth of field, focus transition, editing beat, and temporal rhythm. Maintain the original orange photography-studio background, the top-hanging microphones, the performers’ relative depth, their starting left and right positions, their height relationship, the distance between them, and all original stage-space relationships.
If the performers briefly cross, overlap, or exchange apparent screen positions, follow each original motion trajectory continuously. Do not swap Character A and Character B simply because one moves to the other side of the frame. Preserve foreground and background order, occlusion, entry and exit timing, and the exact screen-space relationship wherever the source video provides it.
LIGHTING, COMPOSITING, AND MATERIAL INTEGRATION:
Integrate the replacement characters naturally into the source footage. Match the original orange studio lighting, direction and softness of shadows, highlights, reflections, color temperature, exposure, contrast, perspective, depth of field, grain, compression, and motion blur. Keep character edges stable during movement and camera changes. Make the character materials respond consistently to the source lighting without introducing a new environment, a new color grade, or an unrelated cinematic style.
Preserve realistic contact with the original stage space. Keep feet, lower bodies, microphones, shadows, occlusions, and foreground-background relationships aligned with the source video. Do not let reference-image backgrounds, borders, panels, or studio layouts appear in the result.
AUDIO AND TIMELINE:
Keep the original singing audio exactly aligned to the source video’s timeline, rhythm, dynamics, pauses, and volume changes. Preserve the original music, singing, room sound, microphone presence, and timing only as they exist in the uploaded source. Do not add dialogue, narration, voice-over, subtitles, captions, sound effects, music, or a new vocal performance. Do not retime the audio to fit newly invented movement; fit the character replacement to the original audio and video timing.
SAFETY AND CONTENT BOUNDARIES:
This is a fictional stage singing performance. Do not depict combat, attack, weapon use, ammunition, explosions, wounds, blood, gore, threats, or real military operations. The performers’ hands may perform only the original stage gestures from the source video. Do not add weapons, dangerous props, political symbols, real military organizations, national flags, brand logos, film logos, title cards, subtitles, captions, or watermarks.
ENDING AND OUTPUT STATE:
End exactly when the source video ends, with the same final shot, final positions, final gestures, final lighting, final audio state, and final edit timing. The result must be a clean full-screen edited singing video containing exactly two original characters, with no visible reference-image panels, no split-screen character sheet, no extra people, and no generated text.
NEGATIVE PROMPT:
Changing the source choreography, new choreography, new gestures, new dialogue, narration, voice-over, new music, changed singing audio, changed audio timing, lip-sync animation, exposed human face, visible human lips, human mouth, wrong mask, wrong helmet, wrong head shape, identity swap, face swap between characters, character cloning, extra performer, missing performer, performer duplication, screen-left and screen-right identity exchange, incorrect crossing trajectory, broken occlusion, changed height ratio, changed distance, changed foreground-background order, changed microphone position, missing hanging microphone, new microphone, changed orange studio background, reference-image background, white reference sheet, dark alien environment, battlefield, weapons, ammunition, combat, attack, explosion, wounds, blood, gore, threat, realistic military operation, political symbols, national flags, brand logo, film logo, subtitles, captions, title cards, watermarks, split screen, triptych, character turnaround sheet, model sheet, storyboard panels, image borders, extra props, dangerous hand actions, deformed hands, extra limbs, unstable clothing, changing armor, changing mask, changing helmet, changing colors, material flicker, texture flicker, facial drift, anatomy drift, temporal flicker, frame interpolation artifacts, frozen body, stiff motion, broken tracking, floating feet, incorrect shadows, wrong perspective, mismatched depth of field, missing motion blur, excessive motion blur, low quality, blurry character replacement.
RIGHTS AND SOURCE-MATERIAL NOTE:
Use the source video and its music, singing, and imagery only when you own them or have permission to edit them. If the source contains third-party material and you do not have authorization, replace it with a self-owned or properly licensed singing video and audio before using this workflow.
Final Summary
Use the original singing video as the sole editing master and replace only the two performers. Character A from image 1 takes the original left performer’s identity track, while Character B from image 2 takes the original right performer’s identity track. Preserve the original singing performance, audio timeline, camera cuts, framing, orange studio background, hanging microphones, lighting, shadows, perspective, depth of field, motion blur, and spatial relationships.
The two reference images control appearance only. They must never become first frames, end frames, backgrounds, split-screen panels, or character sheets inside the output. Track each identity through crossings and camera changes using the original motion path, not the character’s temporary screen position. The finished result is a two-character fictional stage performance with no added dialogue, subtitles, weapons, violence, or unrelated visual elements.