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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.
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]
It supports HEVC/H.265 decode up to 1080p60 4:2:2 10bits (Main10 profile at Level 4.1 High Tier). [ 55 ] On July 23, 2013, MulticoreWare released alpha source code for x265 , [ 56 ] [ 57 ] a video encoder application and library for encoding video into an HEVC bitstream. x265 is an open source [ 58 ] software available under GNU GPL v2 license .
Series of objective HEVC/AV1 codecs comparisons 2015 Oct. 2016 Aug. 2017 Sept. 2018 Sept. 2015: f265 H.265 Encoder, Intel MSS HEVC GAcc, Intel MSS HEVC Software, Ittiam HEVC Hardware Encoder, Ittiam HEVC Software Encoder, Strongene Lentoid HEVC Encoder, SHBP H.265 Real time encoder, x265, InTeleMax TurboEnc, SIF Encoder, VP9 Video Codec, x264
MPEG-H HEVC (H.265) Lossy or lossless: 2013-06 Patent encumbered [52] Yes [II] Yes Yes [55] Yes Yes Yes [56] Yes Yes MPEG-4 AVC (H.264) Lossy or lossless: 2004-08 Patent encumbered [57] Yes Yes Yes Yes Yes [III] Yes Yes [58] Yes AV1: Lossy or lossless: 2018-03 Patent claims Beta [59] Yes No No No No Planned No VP9: Lossy or lossless: 2013-06 ...
The following is a list of compression formats and related codecs. Audio compression formats ... (decoder only, uses x265 to read HEVC encoded files) [42] FFmpeg ...
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At the July 2012 HEVC meeting it was decided, based on proposal JCTVC-J0334, that HEVC level 5 and higher would be required to use CTB sizes of either 32×32 or 64×64. [ 3 ] [ 12 ] This was added to HEVC in the Draft International Standard as a level limit for the Log2MaxCtbSize variable.