cut audio / video, mp3, flac, etc.

#!/bin/bash

function cut_audio_mp3() {
  readarray -t mp3_files < <(find ./ -maxdepth 1 -type f -regex '.*\.\(mp3\|flac\)$' | sed "s/.*\///")
  if [ ${#mp3_files[@]} -eq 1 ]; then
    j=0
    for i in "$@"; do
      ((j++))
      if [ $((j%2)) -eq 0 ]; then
        end_time=$i
        MPHR=60
        IFS=':' read -ra start_array <<< "$start_time"
        IFS=':' read -ra end_array <<< "$end_time"
        len_start_min=${#start_array[0]}
        len_start_sec=$(( $len_start_min + 1 ))
        len_end_min=${#end_array[0]}
        len_end_sec=$(( $len_end_min + 1 ))
        start_time_sec=$(( ( 10#${start_time:0:$len_start_min} ) * MPHR + 10#${start_time:$len_start_sec} ))
        duration=$(( ( 10#${end_time:0:$len_end_min} - 10#${start_time:0:$len_start_min} ) * MPHR + 10#${end_time:$len_end_sec} - 10#${start_time:$len_start_sec} ))
        file_name=$(basename "${mp3_files[0]}" | cut -d. -f1)
        file_extension=$(basename "${mp3_files[0]}" | cut -d. -f2)
        escape=("[" "]" "~" "!" "{" "}" "(" ")" "$" "@" "<" ">" ":" ";" "," '`' "%" "+" "=" '"' "|" "?" '*' "&" " " "'")
        for e in "${escape[@]}"
        do
          file_name=${file_name//[$e]/\\$e}
        done
        file_name=${file_name//"\\'"/"'\"\'\"'"}
        out_name=$(echo $file_name"_"$start_time"-"$end_time"."$file_extension | sed s/:/_/g)
        # removes metadata
        cmd=$(echo ffmpeg -y -ss $start_time_sec -t $duration -i "$file_name"."$file_extension" -map_metadata -1 -c:a copy "$out_name")
        # no metadata removal
        # cmd=$(echo ffmpeg -y -ss $start_time_sec -t $duration -i "$file_name"."$file_extension" -c:a copy "$out_name")
        # echo $cmd
        bash -c "$cmd" &
      else
        start_time=$i
      fi
    done
  else
    echo "error, 2 or more input files detected"
  fi
}

cut_audio_mp3 01:00 01:15
# cut_audio_mp3 01:00 01:15 30:01 30:22 60:05 70:10
# dependecies:
  # sudo apt install ffmpeg
# function usage:
  # function name followed by start time, end time, time markers respectively
  # put only 1 mp3 or 1 flac file in the same folder as script file (chmod +x cut_audio_mp3.bash)