libavcodec/dvdec.c:261: error: Uninitialized Value
  The value read from is_field_mode[_] was never initialized.

libavcodec/dvdec.c:261:53: 
259.             (s->sys->pix_fmt == AV_PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
260.             (s->sys->height >= 720 && mb_y != 134)) {
261.             y_stride = (s->frame->linesize[0] << ((!is_field_mode[mb_index]) * log2_blocksize));
                                                         ^
262.         } else {
263.             y_stride = (2 << log2_blocksize);
