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怎样在DM8168平台捕获视频上面添加字符



我现在想在capture数据display的时候在视频画面某个区域显示我想添加的字符(例如在右上角显示时间、特定标志灯)。看DVRRDK代码里面没有想过的接口,不知道具体需要怎么去实现?希望专家和牛人们给点指导

谢谢~~~1