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DM8168 怎么指定视频输出的范围?



现在在做一个视频相关的项目,要求把源视频(比如说1920*1080),只截取其中指定区域的视频然后输出(比如说只要第100行到500行,第70列到800列的一个矩形),请问这个截取参数的设定是应该在哪个文件中?感激不尽!