libavcodec/dv.c:510: error: Uninitialized Value
  The value read from is_field_mode[_] was never initialized.

libavcodec/dv.c:510:9: 
508.         }
509.         y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x) << log2_blocksize);
510.         linesize = s->picture.linesize[0] << is_field_mode[mb_index];
             ^
511.         mb[0]    .idct_put(y_ptr                                   , linesize, block + 0*64);
512.         if (s->sys->video_stype == 4) { /* SD 422 */
