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'Next-Gen Video Encoding: x265 Tackles HEVC/H.265'. 'H.265 benchmarked: Does the next-generation video codec live up to expectations?'.

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Open source software projects which utilize x265 for HEVC encodingĬommercial products that utilize x265 for HEVC encoding X265 can be invoked as a command line application or integrated into another application through the application programming interface. Netflix stated that with the VMAF metric (which closely mirrors human visual experience according to the author) x265 performed substantially (19% to 22%) better than VP9.

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In August 2016, Netflix published a comparison of x264, VP9, and x265 using video clips from 500 movies and TV shows using 6 different quality metrics and found that both VP9 and x265 have 40%–50% better quality at 1080p than x264. Ī codec comparison from 2015 found x265 to be a leading HEVC implementation measured by SSIM metric. Judged by the objective quality metric VQM in 2015, x265 delivered video quality on par with the reference encoder of the royalty-free VP9 format that competes with HEVC. In April 2015, at the NAB Show in Las Vegas, MulticoreWare demonstrated high quality real-time 4K 10-bit HEVC encoding at frame rates in excess of 60 FPS on a dual Intel Xeon E5 v3 server, occupying only one standard rack unit.

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Temporal scalability is supported, allowing for a video to be encoded into a base layer HEVC bitstream that is half the frame rate of the input video frame rate, and an enhancement layer that can be decoded along with the base layer to enable playback at the full frame rate. Visual quality algorithms include CU-Tree (the successor to x264's macroblock-tree), adaptive quantization, b-pyramid, weighted prediction and psycho-visual optimizations (psy-rd and psy-rdoq). x265 supports most of the features of x264 including all rate control modes: Constant QP (CQP), Constant Rate Factor (CRF), Average Bit Rate (ABR), 2-pass or multi-pass and video buffering verifier rate control. X265 supports the Main, Main 10, Main 12 and Main Still Picture profiles 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. X265 source code is written in C++ and assembly. The stable version (2.0) was released on July 14, 2016. In February 2014, x265 was integrated into the popular multimedia transcoding tool FFmpeg and its fork Libav. The x265 project was initially funded by a small group of charter licensee companies that direct the development requirements and receive commercial licenses to use x265 in their products without having to release their products under the GPL 2 license. MulticoreWare made the source code for x265 publicly available on July 23, 2013.

The project has licensed the rights to use the x264 source code. X265 builds on source code from x264, an open-source video encoder for the previous MPEG video coding standard H.264/MPEG-4 AVC.