Device of one of video encoding such as one of video encoder or decoder of video one may be configured for encoding an duration between the time of removal of intermediate memory of encoded images (CPB) of one of the first decoding unit (DU) is one of access unit (AU) and one second DU is where the second DU is subsequent to the first DU is the order of decoding and is the same that the first AU DU; the device of coding of video may further determine one time of removal of the DU with base to the less in the encoded length; the device of codification also may encode one of message information of additional improvement (SEI) of timing of background associated with the first DU; the device of coding of video may further determine one time of removal of the DU with base to the less in part in the SEI message of timing of sub-image.

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