how to do modification of capture_encode sample code in omx for achieving slice mode encoding?

Hi,
   I have already run successfully capture_encode sample code on my dm8168 evm. This sample 's output is based on frame level(Output after one complete frame is encoded).But for achieving low latency, I need to implement the slice mode. By referring to the document "H264_Encoder_HDVICP2_UserGuide.pdf", I do modification below of ilclient_utils.c in capture_encode project.  
 
OMX_ERRORTYPE IL_ClientSetEncodeParams (IL_Client *pAppData)
{
... ...
#if 1
  /* before creating use set_parameters, for run-time change use set_config
     all codec supported parameters can be set using this index       */
 
  OMX_INIT_PARAM (&tDynParams);
 
  tDynParams.nPortIndex = OMX_VIDENC_OUTPUT_PORT;
 
  eError = OMX_GetParameter (pHandle, OMX_TI_IndexParamVideoDynamicParams,
                             &tDynParams);
 
  tDynParams.videoDynamicParams.h264EncDynamicParams.sliceCodingParams.sliceCodingPreset = IH264_SLICECODING_USERDEFINED;
  tDynParams.videoDynamicParams.h264EncDynamicParams.sliceCodingParams.sliceMode = IH264_SLICEMODE_MBUNIT;
  tDynParams.videoDynamicParams.h264EncDynamicParams.sliceCodingParams.sliceUnitSize = 120*1;
  tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.putDataFxn = &Myslicecbfunc;
  tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.putDataHandle = pHandle;
 
  eError = OMX_SetParameter (pHandle, OMX_TI_IndexParamVideoDynamicParams,
                             &tDynParams);
#endif
 
#if 1
 
  OMX_INIT_PARAM (&tStaticParam);
 
  tStaticParam.nPortIndex = OMX_VIDENC_OUTPUT_PORT;
   
  eError = OMX_GetParameter (pHandle, OMX_TI_IndexParamVideoStaticParams,
                             &tStaticParam);
 
 
  tStaticParam.videoStaticParams.h264EncStaticParams.videnc2Params.outputDataMode = IVIDEO_SLICEMODE;
  tStaticParam.videoStaticParams.h264EncStaticParams.videnc2Params.numOutputDataUnits = 1;
 
  eError = OMX_SetParameter (pHandle, OMX_TI_IndexParamVideoStaticParams,
                             &tStaticParam);
 
#endif  
... ...
}
 
But the program crashed when running on evm. I guess it is caused by next instruction:
tDynParams.videoDynamicParams.h264EncDynamicParams.videnc2DynamicParams.putDataHandle = pHandle;
But I do not know which handle I should pass to IVIDENC2_namicParams: putDataHandle. Can you give me help about how to implement the slice encoding mode? Thank you!