libavcodec/h264_refs.c:557: error: Uninitialized Value
  The value read from pic was never initialized.

libavcodec/h264_refs.c:557:5: 
555.     int i, av_uninit(j);
556.     int current_ref_assigned = 0, err = 0;
557.     H264Picture *av_uninit(pic);
         ^
558. 
559.     if (!h->explicit_ref_marking)
