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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.
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).
MPEG-H HEVC (H.265) Lossy or lossless: June 2013 Patent encumbered [52] Yes [II] Yes Yes [55] Yes Yes Yes [56] Yes Yes MPEG-4 AVC (H.264) Lossy or lossless: August 2004 Patent encumbered [57] Yes Yes Yes Yes Yes [III] Yes Yes [58] Yes AV1: Lossy or lossless: March 2018 Patent claims Yes [59] [60] Yes No No No No Planned No VP9: Lossy or ...
High Efficiency Video Coding (HEVC), a.k.a. H.265 and MPEG-H Part 2 is a successor to H.264/MPEG-4 AVC developed by the same organizations, while earlier standards are still in common use. H.264 is perhaps best known as being the most commonly used video encoding format on Blu-ray Discs .
x265 is an encoder for creating digital video streams in the High Efficiency Video Coding (HEVC/H.265) video compression format developed by the Joint Collaborative Team on Video Coding (JCT-VC). [ 4 ] [ 5 ] [ 6 ] It is available as a command-line app or a software library , under the terms of GNU General Public License (GPL) version 2 or later ...
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 .
The H.264 specification calls H.261, H.262, H.263, and H.264 video coding standards and does not contain the word codec. [2] The Alliance for Open Media clearly distinguishes between the AV1 video coding format and the accompanying codec they are developing, but calls the video coding format itself a video codec specification. [3]
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.