用 Seedance 2.5 做视频人物替换的实操心得

参考视频偶尔会被平台拒收，解决办法是先用 Codex 把人脸模糊后再重新提交。实测中一次替换两个角色效果最好，作者是先替换两位人物，再跑一轮换第三位。

提示词的关键是让视频只提供动作、表情和镜头语言，图片只提供身份和服装，并要求保留原始表演。

Okay I think I've cracked the code on these. Seedance 2.5 is very good if you upload a reference video + images of new characters and ask to swap. In some cases the ref video will get rejected - so I just ask Codex to blur the faces and resubmit 😂 It's also best doing two characters at a time. For this one I did Dario and Jensen first and then re-ran it with Sam. Prompt below. Edit the entire source video @ Video1. Replace the viewer's FAR RIGHT performer with the man in @ Image1 in the same pink shirt and blue / gray hoodie. Keep the LEFT and MIDDLE performers the same. The photos provide identity and wardrobe only. The video provides motion, expressions, gestures, timing, interactions, camera cuts, framing, lighting and background. Preserve the original performance as faithfully as possible. Do not swap positions or invent new movement or scene elements.

This report is categorized under AITOP's "How-to" desk, focusing on China's AI industry and domestic foundation model ecosystem. Within our cross-regional analytical framework, it directly maps to AI developer toolchains, coding agents, and engineering workflows. Key entities and technical topics under continuous tracking include Seedance 2.5, 视频生成, 提示词工程, 人物替换.

Source attribution: curated from Justine Moore (@venturetwins). Cross-source corroboration: 2 independent sources have covered this development (including Pika Labs), confirming industry-wide signal strength.