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mcfw mergelink 通道号被改变

大家好,这是我的usecase流程的一部分:
                               camera
                                    |
                                 ISP
                           |                 |
                      1080P          D1
                           |                 |
                        dup              |
                      |        |             |
                            merge
                                   | 
程序在正常运行一段时间后,d1分辨率这一路的通道号会由0变为1,然后导致程序异常,我跟踪了isplink发现是在Utils_bufGetEmptyFrame(&pObj->outFrameQue[queId],&pEmptyFrame, BIOS_NO_WAIT);函数获取空帧时通道就变为了1,但是在mergelink中System_putLinksEmptyFrames时通道还是0这是什么原因导致的?
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