MB_TYPE_ZERO_MV    75 libavcodec/mpeg12dec.c                     MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
MB_TYPE_ZERO_MV    79 libavcodec/mpeg12dec.c     MB_TYPE_QUANT | MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_ZERO_MV | MB_TYPE_16x16,
MB_TYPE_ZERO_MV   859 libavcodec/mpeg12dec.c         if (mb_type & MB_TYPE_ZERO_MV) {