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In my case, encoding the video with vp8 or vp9 (libvpx) video codec results very high CPU use and some frame drops. This will start recodding the desktop, output video will be in mkv format and encoded with H.264 codec. Record desktop only ffmpeg -f x11grab -s 1366x768 -i :0.0 -r 25 -vcodec libx264 output.mkv Lets have a quick look in some different FFmpeg options. You may want to record the desktop only, no audio or record the desktop with audio and webcam. Sudo pacman -Syu & sudo pacman -S ffmpeg mkvtoolnix-cli In any Arch Linux based distro, install it with pacman.
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If you want compile the latest from source code, get them from here.
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