Streaming Preview Sample Issue

I'm using Black Magic Declink SDK 9.7.7 for the device Black Magic H264 Pro Recorder .When I'm Trying using Streaming Preview MFC Sample application. I'm getting Error on the following Line. causes an error
File DecoderMF.CPP
method :bool DecoderMF::DoProcessInputNAL(IBMDStreamingH264NALPacket* nalPacket)
code:
// Now parse it to the decoder

Code: Select all

   hr = m_h264Decoder->ProcessInput(0, newSample, 0);
   if (FAILED(hr)) //getting failed frequently
      goto bail;

Above segment often get failed.

How to optimize the code so that a video preview with out any gesture or flickering in optimized manner.