screencast-capture.sh

#!/bin/bash
#
# Screencast Capture for Linux
#
# This script uses `ffmpeg` to capture an hd1080 screencast.
# The output is # organized by `scene->shot->take` and saves files into
#
#     $(cwd)/
#       -> ${scene_name}/
#         -> shot-${shot_number}/
#           -> take-${timestamp}/
#             -> *.mkv
#
# Directories are created under the current directory as needed.
#
# Stop this manually with `Ctrl-c` when done
#
# Copyright and related rights waived via CC0

set -o errexit -o nounset -o pipefail

usage() {
        echo "Usage: $0 <scene_name> [<shot_number>]
    where:
      <scene_name> is something like intro-what-is-data-eng
      <shot_number> optional, default is 010"
}
(( $# < 1 )) && usage && exit 1
scene_name=$1
shot_number=${2:-010}

timestamp=`date +%Y-%m-%d-%H%M%S`
output_dir="${scene_name}/shot-${shot_number}/take-${timestamp}"
framerate=30
display=":0.0"

capture_demo() {
  local output_dir=$1
  ffmpeg \
    -hide_banner -nostats -loglevel warning \
    -f x11grab -r $framerate -s hd1080 -i ${display}+0,0 \
    -vcodec libx264 \
    -preset ultrafast \
    $output_dir/demo.mkv > $output_dir/demo.log 2>&1
  echo "demo done"
}

echo "starting ${scene_name}/shot-${shot_number}/take-${timestamp}"

mkdir -p $output_dir

echo "capturing demo - (Ctrl-c when done)"
capture_demo $output_dir &

for job in `jobs -p`; do
  wait $job
done

echo "done"