cut-video

#!/usr/bin/env bash
# Author: Paulo Jerônimo (paulojeronimo.com)
# Links:
#   - Article | https://paulojeronimo.com/posts/cut-video
#   - Video | https://youtube.com/@PauloJeronimo
set -eou pipefail # ref-set
cd "$(dirname "$0")" # ref-cd-to-the-script-location
script_name=$(basename "$0" .sh)
source ./.$script_name 2> /dev/null || { \
  source ~/.$script_name 2> /dev/null || :; } # ref-source
clips_file=${clips_file:-clips.csv} # ref-clips_file
video_var=${video_var:-${PWD##*/}} # ref-video_var
mkv_compression=${mkv_compression:-false}
mkv_tool=${mkv_tool:-HandBrakeCLI} #ref-mkv_tool
$mkv_compression && \
  echo MKV compression will be made by $mkv_tool! || \
  mkv_tool=
go_ahead=true # ref-go_ahead
for t in ffmpeg $mkv_tool
do
  command -v $t > /dev/null || { # ref-command-isnt-in-path
    echo Command \"$t\" not found ...
    go_ahead=false
  }
done
for f in "$clips_file" original-video
do
  [ -f "$f" ] || { # ref-file-not-found
    echo File \"$f\" not found ...
    go_ahead=false
  }
done
$go_ahead || { # ref-abort
  echo Aborting due to the problems reported above!
  exit 1
}
log=$script_name.log; > $log # ref-log
while IFS=, read -r ss to video # ref-read-csv
do
  gen_file=$(sed "s,\$video,$video_var,g" <<< "$video") #ref-gen_file
  echo ffmpeg -nostdin -y -i original-video \
    -ss $ss -to $to -c:v copy \"$gen_file\" | tee last-cmd # ref-ffmpeg
  sed 's/^/\$ /g' last-cmd >> $log; bash < last-cmd &>> $log
  ! $mkv_compression || { # ref-mkv_compression
    [ -f ./$mkv_tool.$$ ] || echo "#!/usr/bin/env bash" > $mkv_tool.$$
    [ "$mkv_tool" = HandBrakeCLI ] && \
      cmd="$mkv_tool -i \"$gen_file\" -o \"${gen_file%.*}.mkv\"" || \
      cmd="$mkv_tool \"$gen_file\""
    echo -e "tee last-cmd <<< '$cmd'\nsed 's/^/\$ /g' last-cmd >> \
      $log\nbash < last-cmd &>> $log" >> $mkv_tool.$$
  }
done < "$clips_file"
! $mkv_compression || {
  mv -f ./$mkv_tool.$$ ./$mkv_tool; chmod +x ./$mkv_tool; ./$mkv_tool; }
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