dmenurecord

apt install dmenu i3 ffmpeg i3blocks
touch ~/scripts/dmenurecord
nano dmenurecord
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#!/bin/sh

# Usage:
# `record`: Ask for recording type via dmenu
# `record screencast`: Record both audio and screen
# `record video`: Record only screen
# `record audio`: Record only audio
# `record kill`: Kill existing recording
#
# If there is already a running instance, user will be prompted to end it.

updateicon() { \
    echo "$1" > /tmp/recordingicon
    pkill -RTMIN+9 i3blocks
    }

killrecording() {
    recpid="$(cat /tmp/recordingpid)"
    # kill with SIGTERM, allowing finishing touches.
    kill -15 "$recpid"
    rm -f /tmp/recordingpid
    updateicon ""
    pkill -RTMIN+9 i3blocks
    # even after SIGTERM, ffmpeg may still run, so SIGKILL it.
    sleep 3
    kill -9 "$recpid"
    exit
    }

screencast() { \
    ffmpeg -y \
    -f x11grab \
    -framerate 60 \
    -s $(xdpyinfo | grep dimensions | awk '{print $2;}') \
    -i :0.0 \
    -f alsa -i default \
    -r 30 \
     -c:v libx264rgb -crf 0 -preset ultrafast -c:a flac \
    "$HOME/screencast-$(date '+%y%m%d-%H%M-%S').mkv" &
    echo $! > /tmp/recordingpid
    updateicon "⏺️🎙️"
           }

video() { ffmpeg \
    -f x11grab \
    -s $(xdpyinfo | grep dimensions | awk '{print $2;}') \
    -i :0.0 \
     -c:v libx264 -qp 0 -r 30 \
    "$HOME/video-$(date '+%y%m%d-%H%M-%S').mkv" &
    echo $! > /tmp/recordingpid
    updateicon "⏺️"
    }

webcamhidef() { ffmpeg \
    -f v4l2 \
    -i /dev/video0 \
    -video_size 1920x1080 \
    "$HOME/webcam-$(date '+%y%m%d-%H%M-%S').mkv" &
    echo $! > /tmp/recordingpid
    updateicon "🎥"
    }

webcam() { ffmpeg \
    -f v4l2 \
    -i /dev/video0 \
    -video_size 640x480 \
    "$HOME/webcam-$(date '+%y%m%d-%H%M-%S').mkv" &
    echo $! > /tmp/recordingpid
    updateicon "🎥"
    }


audio() { \
    ffmpeg \
    -f alsa -i default \
    -c:a flac \
    "$HOME/audio-$(date '+%y%m%d-%H%M-%S').flac" &
    echo $! > /tmp/recordingpid
    updateicon "🎙️"
    }

askrecording() { \
    choice=$(printf "screencast\\nvideo\\naudio\\nwebcam\\nwebcam (hi-def)" | dmenu -i -p "Select recording style:")
    case "$choice" in
        screencast) screencast;;
        audio) audio;;
        video) video;;
        webcam) webcam;;
        "webcam (hi-def)") webcamhidef;;
    esac
    }

asktoend() { \
    response=$(printf "No\\nYes" | dmenu -i -p "Recording still active. End recording?") &&
    [ "$response" = "Yes" ] &&  killrecording
    }


case "$1" in
    screencast) screencast;;
    audio) audio;;
    video) video;;
    kill) killrecording;;
    *) ([ -f /tmp/recordingpid ] && asktoend && exit) || askrecording;;
esac
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https://pastebin.com/yxEHip3T
i3 config
--------------------------------------------
 set $stoprec --no-startup-id ~/scripts/dmenurecord kill
bindsym $mod+Print exec --no-startup-id ~/scripts/dmenurecord
bindsym $mod+Delete exec $stoprec