Video coder or video decoder such as video coding device may by equal sub image time series arrangement to the first decoding unit DU coding and access unit AU of each relevant supplemental enhancement information and SEI information. The video coding device capable of coding the AU and further wherein the sub picture SEI information and according to the second DU sequence and decoding the coding image buffer by CPB removing time CPB of the first and DU removing the lasting time between time. The coding device also can at least part said sub image based on time series SEI message derive the first DU of CPB removing time.

A video coding device such as a video encoder or a video decoder may be configured to code a sub-picture timing supplemental enhancement information (SEI) message associated with a first decoding unit (DU) of an access unit (AU). The video coding device may further code a duration between coded picture buffer (CPB) removal time of a second DU of the AU in decoding order and CPB removal time of the first DU in the sub-picture SEI message. The coding device may also derive a CPB removal time of the first DU based at least in part on the sub-picture timing SEI message.