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dvrrdk4.0 declink输出图像copy



我的开发环境是dvrrdk4.0,declink解码输出的图像是解码器内部的图像,因为我要修改图像,如果直接在输出图像上处理的话会影响解码器后续的解码,请问怎么样使declink输出的是内部图像的copy,而不是内部图像?

为了copy图像能不能使用duplink?

duplink的numOutQue必须大于1吗?