FIELD: physics.
SUBSTANCE: invention relates to equipment, devices, a system and methods for encoding and decoding a multi-level video bit stream. Encoding method comprises generation by a video encoder of a layer access unit including a network abstraction layer (NAL) unit of a picture header (PH) preceding the first video coding layer (VCL) NAL unit, wherein the first VCL NAL unit includes a slice of the encoded image, wherein the PH NAL unit has a PH NAL unit type (PH NUT), wherein the PH NAL unit is a non-VCL NAL unit, wherein the TemporalId value for non-VCL NAL units is limited as follows: if nal_unit_type is DPS_NUT, VPS_NUT or SPS_NUT, TemporalId is equal to 0, and TemporalId of the level access unit containing the NAL unit shall be equal to 0; if nal_unit_type is equal to PH_NUT, TemporalId shall be equal to TemporalId of the access unit of the layer containing the NAL unit; encoding, by a video encoder, a layer access unit into a video bitstream, wherein the video bitstream is a multi-level video bitstream including multiple encoded images or multiple level access units in the same access unit; and the video encoder storing the video bitstream for transmission to the video decoder.
EFFECT: possibility of accurate determination of the initial point of an image in a multilevel bit stream of video.
23 cl, 12 dwg, 9 tbl
