libavcodec/dv.c:505: error: Uninitialized Value
  The value read from is_field_mode[_] was never initialized.

libavcodec/dv.c:505:52: 
503.             (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) ||
504.             (s->sys->height >= 720 && mb_y != 134)) {
505.             y_stride = (s->picture.linesize[0]<<((!is_field_mode[mb_index])*log2_blocksize));
                                                        ^
506.         } else {
507.             y_stride = (2<<log2_blocksize);
