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The UV color problem

Hi all

I use DVRRDK 4.0,8 channels D1 input,and my chains is

capture->dei->sclr->nsf->ipcFramesOutVpss(->prcesslink(ipcFramesInDSP->alg))->ipcOutVpss->ipcInVideo->enc->ipcBitsOutVideo->ipcBitsInHost

in alg link video is YUV420SP,i just process UV like below,didn't process Y

memset((unsigned char*)(pFrame->addr[0][1]),0x80,FRAME_Y_WIDTH*FRAME_Y_HEIGHT/2); 

and i see there is color flicker(on and off) in the video,it look like,i had already setted the UV to 0x80,why there is still colors in video.