sh 将m4a文件递归转换为mp3

Posted 2021-05-06

#!/bin/bash
#
#
#set -ux
set +e
if [ -z "$1" ] ; then
    TRANSCODEDIR="."
else
    TRANSCODEDIR="$1"
fi

abs_basefolder=`realpath "$TRANSCODEDIR"`
folder_base=`dirname "$abs_basefolder"`
folder_name=`basename "$abs_basefolder"`

function recursive_convert {
    find "$1" -type d -print0 |
    while IFS= read -rd '' directory_to_convert; do 
        echo "Converting files in $directory_to_convert"; 
        output_directory=$directory_to_convert              
        echo "Converted files will be saved in $output_directory"; 
        # TODO only find video files
        # *.mkv *.webm *.flv *.avi *.mov *.wmv *.mp4 *.mp4$ *.m4v *.flv
        find "$directory_to_convert" -maxdepth 1 -mindepth 1 -type f -print0 | 
        while IFS= read -r -d '' file_to_convert; do
            file_to_convert_filename=$(basename "$file_to_convert")
            if [[ ${file_to_convert_filename: -4} == ".m4a" ]]; then
                converted_filepath="$output_directory/${file_to_convert_filename%.*}.mp3"
                # If the file doesn't exist then convert
                if [ ! -e "$converted_filepath" ]; then
                    echo "Converting $file_to_convert"
                    avconv -i "$file_to_convert" "$converted_filepath"  </dev/null
                    rm "$file_to_convert"
                else
                    echo "$converted_filepath already exists"
                fi
            fi
        done
    done
}

recursive_convert "$abs_basefolder"