角色动画和角色替换是不同任务：前者让参考角色跟随动作，后者把视频中的角色换成参考角色。先明确模式，再准备对应的参考图、姿态视频和预处理结果。 Character animation and character replacement are different tasks. The first makes a reference character follow motion; the second replaces a video character. Choose the mode first, then prepare the matching reference image and processed motion input.