libavcodec/dvdec.c:266: error: Uninitialized Value
  The value read from is_field_mode[_] was never initialized.

libavcodec/dvdec.c:266:9: 
264.         }
265.         y_ptr = s->frame->data[0] + ((mb_y * s->frame->linesize[0] + mb_x) << log2_blocksize);
266.         linesize = s->frame->linesize[0] << is_field_mode[mb_index];
             ^
267.         mb[0]    .idct_put(y_ptr                                   , linesize, block + 0*64);
268.         if (s->sys->video_stype == 4) { /* SD 422 */
