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OMX Dup port feature

GD
Prodigy 140 points

I'm having some difficulty getting the Dup-ports feature working in EZSDK 5.03.00.09 with DM8168

I currently have a VFCC->VFPC->VENC path working. I'm trying to dup the VFCC output and create another similar path. I added the code below to the VFCC configuration. I also connected port 16 of the VFCC to another VFPC. The configuration code runs OK with no errors. However once the first frame comes in, the VPSS asserts on line 1290 in FrameQBufMgr_ShMem.c.



        sDupPortInfo.nPortIndex     = 0;
        sDupPortInfo.nNumDupedPorts = 1;
        sDupPortInfo.auDupedPortsIndex[0] = 16;
        eError = OMX_SetParameter(handle,
                                  (OMX_INDEXTYPE)OMX_IndexParamDupPorts,
                                  (OMX_PTR)&sDupPortInfo);

Any thoughts? Have I missed configured something? Is there documentation on this feature?