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一开始是想制作那种纯黑背景文字淡入然后淡出，发现唤镜里面不太满意，然后试了用视频，发现不能导入，最后转成序列用帧播放但是很卡顿，这个怎么解决。
调一下动画播放速度试试，不过用帧动画来做还是有点呛的，比较吃图片内存占用
