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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.
High Efficiency Video Coding (HEVC), also known as H.265 and MPEG-H Part 2, is a video compression standard designed as part of the MPEG-H project as a successor to the widely used Advanced Video Coding (AVC, H.264, or MPEG-4 Part 10).
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
On June 10, 2013, Vanguard Video announced that support for the Main 10 profile was added to their V.265 professional HEVC encoder. [51] V.265 is the first real time HEVC software encoder to support the Main 10 profile. [51] On June 20, 2013, Imagination Technologies announced their PowerVR Series5 HEVC decoder. [52]
x265 source code is written in C++ and x86 assembly. [3]x265 supports the Main, Main 10, Main 12 and Main Still Picture profiles [11] of HEVC (including intra-only profiles), utilizing a bit depth of either 8 bits or 10 bits per sample YCbCr with 4:2:0, 4:2:2 or 4:4:4 chroma subsampling.
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 ...
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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 ...