libavcodec/h264_refs.c:153: error: Uninitialized Value
  The value read from lens[_] was never initialized.

libavcodec/h264_refs.c:153:25: 
151. 
152.         if (lens[0] == lens[1] && lens[1] > 1) {
153.             for (i = 0; i < lens[0] &&
                             ^
154.                         h->default_ref_list[0][i].parent->f.buf[0]->buffer ==
155.                         h->default_ref_list[1][i].parent->f.buf[0]->buffer; i++);
