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#!/usr/bin/env bash
#
# Screencast recorder
#
# See https://links.fluxo.info/bookmarks/rhatto/screencast
# https://askubuntu.com/questions/4428/how-can-i-record-my-screen
# https://github.com/dilawar/Scripts/blob/master/record_my_desktop.sh
# https://trac.ffmpeg.org/wiki/Capture/Desktop
# https://andreafortuna.org/2019/09/20/how-to-record-screen-on-linux-from-command-line/
# https://superuser.com/questions/510985/how-can-i-crop-a-video-to-a-part-of-the-view
#
# Parameters
BASENAME="`basename $0`"
OUT="$1"
# Syntax check
if [ -z "$OUT" ]; then
echo "usage: $BASENAME <outfile>"
echo "example: $BASENAME out.mkv"
exit 1
fi
# Calculate
Xaxis=$(xrandr -q | grep '*' | uniq | awk '{print $1}' | cut -d 'x' -f1)
Yaxis=$(xrandr -q | grep '*' | uniq | awk '{print $1}' | cut -d 'x' -f2)
# Dispatch with vertical offset
#ffmpeg -f x11grab -r 25 -s 1366x752 -i :0.0+0,16 -vcodec libx264 -vpre lossless_ultrafast -threads 0 $OUT
# Dispatch
#ffmpeg -f x11grab -r 25 -s 1366x752 -i :0.0 -vcodec libx264 -vpre lossless_ultrafast -threads 0 $OUT
# Run
ffmpeg -f x11grab -s $(($Xaxis))x$(($Yaxis)) -r 25 -i :0.0 -qscale 0 $OUT
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