libavcodec/h264_refs.c:143: error: Uninitialized Value
  The value read from lens[_] was never initialized.

libavcodec/h264_refs.c:143:13: 
141.         }
142. 
143.         if (lens[0] == lens[1] && lens[1] > 1) {
                 ^
144.             for (i = 0; h->default_ref_list[0][i].f.data[0] == h->default_ref_list[1][i].f.data[0] && i < lens[0]; i++);
145.             if (i == lens[0]) {
