2.2.3 H.263 Payload Header, Draft Mode

The fields defined in the H.263 payload header in draft mode differ from the payload header in RFC mode in the following ways:

  • The orders of the following fields are rearranged: I, A, S, R, HMV1, VMV1, HMV2, and VMV2.

  • The sizes of the following fields are different: MBA, HMV1, VMV1, HMV2, VMV2, and R.

  • The H.263 payload header in draft mode does not specify a U field.

Details of these differences are specified in the following sections.