X265rips !exclusive!

ffmpeg -i input.mkv -c:v libx265 -preset slow -crf 18 -pix_fmt yuv420p10le \ -x265-params "aq-mode=3:no-sao=1:deblock=-1,-1" -c:a libopus -b:a 128k output.mkv

What (Windows, Mac, Android, Smart TV) are you using? x265rips

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Before x265, downloading or streaming a 4K movie was impractical for anyone without an ultra-high-speed fiber internet connection. Uncompressed or poorly compressed 4K files can easily exceed 50 gigabytes. x265 coding brings 4K files down to manageable sizes, making ultra-high-definition video accessible to users with average internet bandwidth. Furthermore, x265 natively supports 10-bit color depth, which is required to display High Dynamic Range (HDR) content accurately. 3. Faster Streaming and Lower Bandwidth Caps x265 natively supports 10-bit color depth