batch_convert_videos.sh

#!/bin/sh

DIR=$1

EXTENSIONS_LIST="(MOV|MP4|AVI)"
HANDBRAKE_CLI=HandBrakeCLI

find_files() {
  find "$DIR" -type f 2> /dev/null | egrep -i "\.$EXTENSIONS_LIST" | egrep -i --invert-match ".*_s\.$EXTENSIONS_LIST" | egrep --invert-match "/\."
}

get_file_size() {
  stat -f%z "$1"
}

gracefully_exit() {
  echo ""
  if [ $finish -eq 0 ]; then
    echo "[INFO] Gracefully exiting the script once the current video has been completed"
    echo "[INFO] Press ctrl+c again to stop it immediately, and interrupt the current process"
    finish=1
  else
    echo "[INFO] Forced interruption: terminating the current processing"
    echo "[INFO] Cleaning up $new_file"
    # TODO: interrupt processing and delete temp file
    exit 1
  fi
}

finish=0
trap 'gracefully_exit' SIGUSR1 SIGHUP SIGINT SIGTERM INT

find_files | while IFS= read -r old_file; do
  old_file_size=$(get_file_size "$old_file")
  new_file=$(echo $old_file | sed -E "s/\.$EXTENSIONS_LIST/_s.mp4/i")

  if [ ! -f "$new_file" ]; then
    echo "[INFO] converting $old_file"
    ( 
      $HANDBRAKE_CLI \
        --input "$old_file" --output "$new_file" \
        --format av_mp4 --encoder x265 --encoder-preset medium --encoder-profile main --encoder-level 4.0 --quality 22 --pfr --rate 30 --two-pass --turbo \
        --maxWidth 1280 --maxHeight 720 \
        --comb-detect --deinterlace \
        --aencoder ca_aac --mixdown stereo --ab 112 \
        < /dev/null 
    ) <&0 &
    until wait; do :; done
    echo "[INFO] converted $old_file"
  else
    echo "[WARN] skipping $new_file (already exists)"
  fi

  if [ $finish -eq 1 ]; then
    echo "[INFO] Interrupting processing"
    exit 0
  fi

  # new_file_size=$(get_file_size "$new_file")
done