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VP9 is an open and royalty free〔 video coding format developed by Google. VP9 had earlier development names of Next Gen Open Video (NGOV) and VP-Next. VP9 is a successor to VP8. Its own successor, VP10, is currently under development. Chromium, Chrome, Firefox, and Opera support playing VP9 video format in the HTML5 video tag. ==History== The development of VP9 started in the second half of 2011.〔〔 The design goals for VP9 included reducing the bit rate by 50% compared to VP8 while maintaining the same video quality, and aiming for better compression efficiency than the MPEG High Efficiency Video Coding (HEVC) standard.〔〔 In June 2013 the "profile 0" of VP9 was finalized, and two months later Google's Chrome browser was released with support for VP9 video playback.〔〔 In October of that year a native VP9 decoder was added to FFmpeg,〔 and to Libav six weeks later. Mozilla added VP9 support to Firefox in March 2014.〔〔 Throughout, Google has worked with hardware vendors to get VP9 support into silicon. In January 2014, Ittiam demonstrated its VP9 decoder on ARM Cortex devices. The Ittiam VP9 Decoder, built in collaboration with ARM and Google, focuses on balancing power, scale and portability requirements. It can decode 1080p at 30fps using the ARM Mali-T604 GPU on an Arndale board, powered by Samsung’s Exynos 5 Dual SoC.〔〔 In early 2015 Nvidia announced VP9 support in its Tegra X1 SoC, and VeriSilicon announced VP9 Profile 2 support in its Hantro G2v2 decoder IP.〔〔〔 In April 2015 Google released a significant update to its libvpx library, with version 1.4.0 adding support for 10-bit and 12-bit bit depth, 4:2:2 and 4:4:4 chroma subsampling, and VP9 multithreaded decoding/encoding.〔 Microsoft announced in September 2015 that their Microsoft Edge browser will add VP9 support in future release.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「VP9」の詳細全文を読む スポンサード リンク
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