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x265 is an open-source project and free application library for encoding video streams into the H.265/High Efficiency Video Coding (HEVC) format. x265 is available to anyone under the terms of the GNU GPL 2 license. x265 is also available to commercial companies who wish to distribute x265 without the open-source restictions that the GPL license imposes.
brew install x265
This formula is required by Ffmpeg.