Mv merge configuration register.
| MV_MERGE_TYPE | Configure mv merge type.\0: merge p16x16 mv\1: merge min mv\2: merge max mv\3: not valid. |
| INT_MV_OUT_EN | Configure mv merge output integer part not zero mv or all part not zero mv.\0: output all part not zero mv\1: output integer part not zero mv. |
| A_MV_MERGE_EN | Configure whether or not to enable video A mv merge.\0: disable\1: enable. |
| B_MV_MERGE_EN | Configure whether or not to enable video B mv merge.\0: disable\1: enable. |
| MB_VALID_NUM | Represents the valid mb number of mv merge output. |