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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.
On August 13, 2014, Ittiam Systems announces availability of its third generation H.265/HEVC codec with 422 12-bit support. [ 94 ] On August 19, 2014, Nippon Telegraph and Telephone announced that support for the HEVC range extensions was added to their HEVC-1000 SDK software encoder which can encode video using the Main 4:2:2 12 profile.
HEVC was designed to substantially improve coding efficiency compared with H.264/MPEG-4 AVC HP, i.e. to reduce bitrate requirements by half with comparable image quality, at the expense of increased computational complexity. [13] HEVC was designed with the goal of allowing video content to have a data compression ratio of up to 1000:1. [133]
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.
Daala – Experimental Video codec which was under development by the Xiph.Org Foundation and finally merged into AV1. Thor – Experimental royalty free video codec which was under development by Cisco Systems, and merged technologies into AV1. Turing – A High Efficiency Video Coding (HEVC/H.265) encoder implemented by BBC Research.
The maximum NVENC HEVC coding tree unit (CU) size is 32 (the HEVC standard allows a maximum of 64), and its minimum CU size is 8. HEVC encoding also lacks Sample Adaptive Offset (SAO). Adaptive quantization, look-ahead rate control, adaptive B-frames (H.264 only) and adaptive GOP features were added with the release of Nvidia Video Codec SDK 7 ...
The tests also showed that it took 60% longer to decode HEVC video encoded at 16×16 CTU size than at 64×64 CTU size. [2] The tests showed that large CTU sizes increase coding efficiency while also reducing decoding time. [2] The tests were conducted with the Main profile of HEVC based on equal PSNR. [2]
In latest version of Adobe Premiere Elements 7 and Premiere Pro CS4 (both shipped in 2008), both source-video and video-export (to Blu-ray Disc) support H.264. Apple integrated H.264 support into Mac OS X v10.4 "Tiger" and QuickTime 7. The encoder conforms to Main Profile and the decoder supports Constrained Baseline and most of Main Profile. [1]