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关于OSD的问题



使用CCS3.3,DM6437,在VPBE中设置在OSD层显示和在VIDEO1显示有什么区别呢,除了显示优先级,还有是因为OSD是静态而VIDEO1是动态么?还是什么?如果我想根据视频显示情况在屏幕上动态画一条直线应该花在哪,如果是在video层怎么让其他地方透明显示呢?

问题有点多,辛苦啦!!!