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两路视频的切换，需要做到类似ppt的切换效果
如淡入淡出 飞入飞出 滚动进入 滚动飞出
使用mosaic？但是淡入淡出怎么实现？有没有大侠指导下？
或者是osd来实现？osd的源，能使用别的视频流么？
自己又有一个思路，就是通过dsp实现自己的算法来实现
