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The HEVC standard defines thirteen levels. [1] [2] A level is a set of constraints for a bitstream.[1] [2] For levels below level 4 only the Main tier is allowed.[1] [2] A decoder that conforms to a given tier/level is required to be capable of decoding all bitstreams that are encoded for that tier/level and for all lower tiers/levels.
As a subset of the Main 4:4:4 16 Intra profile, the Main 4:4:4 16 Still Picture profile allows for a bit depth of 8 bits to 16 bits per sample with support for 4:0:0, 4:2:0, 4:2:2, and 4:4:4 chroma sampling. [24] Scalable Main The Scalable Main profile allows for a base layer that conforms to the Main profile of HEVC. [24] Scalable Main 10
On January 15, 2014, oViCs announced the ViC-1 HEVC decoder which supports the Main 10 profile at up to 4K at 120 fps. [90]On February 13, 2014, PathPartner Technology Pvt.Ltd announced HEVC Decoder on ARM Cortex-A Family Processors which takes advantage of the full capabilities of mobile SoCs built on latest ARM processors.
A CTU can be between 16×16 pixels and 64×64 pixels in size with a larger size usually increasing coding efficiency. [4] [2] The first video standard that uses CTUs is HEVC/H.265 which became an ITU-T standard on April 13, 2013. [5] [6] [7]
The tenth generation of PureVideo HD, introduced with the Turing-based GeForce RTX 20 and GeForce GTX 16 series, adds full hardware-decoding for three additional HEVC Version 2 profiles (Main 4:4:4, Main 4:4:4 10 and Main 4:4:4 12) to the GPU's video-engine.
The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.
In more modern macroblock-based video coding standards such as H.263 and H.264/AVC, transform blocks can be of sizes other than 8×8 samples. For instance, in H.264/AVC main profile, the transform block size is 4×4. [4] In H.264/AVC High profile, the transform block size can be either 4×4 or 8×8, adapted on a per-macroblock basis. [4]
HEVC has several profiles defined for extending its intra-frame encoding to still images at various bit depths and color formats, including "Main Still Picture," "Main 4:4:4 Still Picture," and "Main 4:4:4 16 Still Picture profiles." BPG is a wrapper for the "Main 4:4:4 16 Still Picture" profile up to 14 bits per sample.