libavcodec/h264.c:2836: error: Uninitialized Value
  The value read from lens[_] was never initialized.

libavcodec/h264.c:2836:96: 
2834. 
2835.         if(lens[0] == lens[1] && lens[1] > 1){
2836.             for(i=0; h->default_ref_list[0][i].data[0] == h->default_ref_list[1][i].data[0] && i<lens[0]; i++);
                                                                                                     ^
2837.             if(i == lens[0])
2838.                 FFSWAP(Picture, h->default_ref_list[1][0], h->default_ref_list[1][1]);
