libavcodec/dvdec.c:290: error: Uninitialized Value
  The value read from is_field_mode[_] was never initialized.

libavcodec/dvdec.c:290:28: 
288.             (s->sys->height >= 720 && mb_y != 134)) {
289.             y_stride = (s->frame->linesize[0] <<
290.                         ((!is_field_mode[mb_index]) * log2_blocksize));
                                ^
291.         } else {
292.             y_stride = (2 << log2_blocksize);
