libavcodec/h264_refs.c:556: error: Uninitialized Value
  The value read from pic was never initialized.

libavcodec/h264_refs.c:556:5: 
554.     int i, av_uninit(j);
555.     int current_ref_assigned = 0, err = 0;
556.     Picture *av_uninit(pic);
         ^
557. 
558.     if ((h->avctx->debug & FF_DEBUG_MMCO) && mmco_count == 0)
