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DM8127 SWOSD problem !

Dear Sirs,

Do you have suggestion for this problem ? 

Enable SWOSD will cause picture NG as this picture. Disable SWOSD and the picture is OK !   

This is currently DM8127 flow . 

"dec->ipcOutVideo->ipcInVpss->SWOSD->ipcOutVpss->ipcInVideo->enc->ipcBitsOutRTOS->ipcBitsInHLOS"
This picture is from SWOSD link address to A8, MMAP to A8 then dump it.
 

 

Original flow that SWOSD is no problem !

rtsp client receive stream data,  ipcBitsOutHLOS->ipcBitsInVideo->dec