First, profile (grade), level (horizontal), tier (tier) exist in order to allow compatibility between different applications II, profile, level, tier relationship 1, the grade specifies which coding tools and algorithms used in the Code stream 2, Level stipulated for the grade, the level of the corresponding decoder processing burden and storage capacity parameters, mainly including the sampling rate, resolution, the maximum value of the bitrate, the minimum value of the compression rate, decoding the image buffer (DPB) capacity, encoding image buffer (CPB) capacity 3, the level of the rate of each level of 4, Support for high-level profiles, levels, and tiers must support low profile, grade, tier, which is known as Compatibility third, class Profile1, main grade (main profile) (1) Bit depth limit is 8bit (2) sample limit is 4:2:0 (3) CTB size from 16x16 to 64x64 (4) The cache capacity of decoded images is limited to 6 images (5) allows selection of wavefront and slice, but cannot select 2, ten bit main grade (main profile) (1) The main indicators and the main grade is similar, but support 10bit depth 3, still image main grade (1) mainly does not support inter-frame prediction coding h265 level and tier limits: h265 limits for general tier and level, where Max Luma picture size is the maximum luminance image size, and the maximum supported value is 35651584 in Levels 6.2. The approximate resolution is the maximum image resolution of 8192x4320; Max slice segments per picture is the maximum SS for each frame; Max of tiles rows is the largest number of rows; max of tile columns maximum number of sheets; Iv. horizontal Leve There are 13 levels in L1 and HEVC: 1, 2, 2.1, 3, 3.1, 4, 4.1, 5, 5.1, 5.2, 6, 6.1, 6.22, and one level is actually I a set of limitations on some column encoding parameters for coded bitstream V, Grade TiEr1, for the same level, according to the maximum bitrate and cache capacity requirements, HEVC set two levels, defined as high-level and primary level. 2, the main level can be used in most scenes, the required code rate is low, 3, high-grade can be used for special requirements or harsh requirements of the place
H265 profile, level, tier
