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P0-3 根因：unified_render_service 中每个 clip 预处理滤镜链里， fps 在 setpts=PTS-STARTPTS 之前执行。当多个视频有不同 timebase/ 帧率时，fps 滤镜基于原始 PTS 进行帧转换，随后的 setpts 仅做 时间偏移，导致各片段 PTS 基准不一致，xfade 转场计算 offset 时 出错。 修复：将 setpts=PTS-STARTPTS 移到 fps 之前，先归一化 PTS 起 点，再统一帧率，确保所有片段在进入 xfade 前有一致的时间基准。 影响范围： - 多视频 xfade 转场模式（主修复目标） - 单视频一镜到底模式（同步修复，保持逻辑一致） 新增测试： - test_setpts_before_fps_in_xfade_inputs: 多视频 xfade 模式验证 - test_setpts_before_fps_single_clip: 单视频模式验证