A video coder in a coding video bit stream by using signal and give out comprises video parameter is a hypothetical reference decoder more HRD parameter syntax structure VPS set the multiple virtual reference decoder of HRD parameter syntax structure each comprises HRD parameter. Syntax element are set and for each corresponding HRD parameter of the multi-HRD parameter syntax structure of the grammar structure said VPS further comprises indicating the corresponding HRD parameter syntax structure of the HRD parameter except for the specific coding video bit flow through specific sub layer of the sub layer HRD specific parameter information of outside if set also comprises HRD parameter is. HRD is the common parameter set for said by code for all sub layer video bit flow and is common and. A video decoder or a device from the other by coding video bit flow decoding the VPS and use of the HRD parameter syntax structure of at least one of the HRD parameter and carrying out operation.

A video encoder signals in an encoded video bitstream a video parameter set (VPS) that includes a plurality of Hypothetical Reference Decoder (HRD) parameter syntax structures that each include HRD parameters. For each respective HRD parameter syntax structure in the plurality of HRD parameter syntax structures the VPS further includes a syntax element indicating whether the HRD parameters of the respective HRD parameter syntax structure include a common set of HRD parameters in addition to a set of sub-layer-specific HRD parameter information specific to a particular sub-layer of the encoded video bitstream. The common set of HRD parameters is common to all sub-layers of the encoded video bitstream. A video decoder or other device decodes from the encoded video bitstream the VPS and performs an operation using the HRD parameters of at least one of the HRD parameter syntax structures.