VP9
From Wikipedia
VP9 is an open and royalty free[1] video coding format developed by Google.
VP9 is a successor to VP8 and competes with MPEGs High Efficiency Video Coding (HEVC/H.265). At first, VP9 was mainly used on Google's popular video platform YouTube.[2][3] The emergence of the Alliance for Open Media and it supporting the ongoing development of the successor AV1 led to growing interest in the format.
VP9 can be multiplexed into WebM streams/files along with Opus audio.[4] Chromium, Chrome, Firefox, and Opera support playing VP9 video format in the HTML5 video tag.
Parts of the format are covered by patents held by Google. The company grants free usage of related own patents based on reciprocity, i.e. as long as the user on his part doesn't engage in patent litigations.[5]

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