The invention describes a technology for selecting coded image buffer CPB parameter by coding the image buffer CPB parameter so as to define video coding device is used for video bit stream in the random access CRA clean and link access BLA picture image is CPB. Coding device receiving video bit stream comprises one or more of the CRA image or BLA image and also receive information said information indicating whether and aiming at the CRA image or BLA image and at least one CPB parameter using the alternative set. The information may received from external device such as including for the treatment device and flow processing server or network entity. The video coding device based on the reception to the message set by defined as indicated for the given one of the image and CPB is the set of variable parameter and based on the aiming at image of the said given one of said variable selection for the image of CPB parameter of the set.

This disclosure describes techniques for selection of coded picture buffer (CPB) parameters used to define a CPB for a video coding device for clean random access (CRA) pictures and broken link access (BLA) pictures in a video bitstream. A video coding device receives a bitstream including one or more CRA pictures or BLA pictures and also receives a message indicating whether to use an alternative set of CPB parameters for at least one of the CRA pictures or BLA pictures. The message may be received from an external means such as a processing means included in a streaming server or network entity. The video coding device sets a variable defined to indicate the set of CPB parameters for a given one of the pictures based on the received message and selects the set of CPB parameters for the given one of the pictures based on the variable for the picture.