東方シリーズ音楽抜き出し機（https://smdn.jp/works/tools/ThbgmExtractor/ ）で抜き出したwaveファイルをmp3にタグ付けしつつ変換するスクリプト。Chat GPTで生成したあと、自分好みに変更した。ffprobeでwavの曲情報を取りつつ、lameでVBRでめちゃ遅変換をする。

wav2mp3.bash

#!/bin/bash

# Check if correct number of arguments are provided
if [ "$#" -ne 1 ]; then
    echo "Usage: $0 <base_directory>"
    echo "       which base_directory has 'wav' subdir having *.wav files."
    exit 1
fi

# Get the input and output directories from arguments
base_directory=$1
base_album="$(basename "$base_directory")"
wav_directory="$base_directory/wav"
mp3_directory="$base_directory/mp3/$base_album．"

# Create the output directory if it doesn't exist
mkdir -p "$mp3_directory"

# Loop over all wav files in the provided wav directory
for wavfile in "$wav_directory"/*.wav;
do
    # Extract the base name of the file (without directory and extension)
    base_name=$(basename "$wavfile" .wav)

    # Define the output mp3 file path
    mp3file="$mp3_directory/$base_name.mp3"

    # Extract metadata from the wav file
    title=$(ffprobe -v quiet -show_entries format_tags=title -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    artist=$(ffprobe -v quiet -show_entries format_tags=artist -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    # istr=$(ffprobe -v quiet -show_entries format_tags=ISTR -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    iwri=$(ffprobe -v quiet -show_entries format_tags=IWRI -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    year=$(ffprobe -v quiet -show_entries format_tags=date -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    track=$(ffprobe -v quiet -show_entries format_tags=track -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    # ifrm=$(ffprobe -v quiet -show_entries format_tags=IFRM -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    copyright=$(ffprobe -v quiet -show_entries format_tags=copyright -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    # encoder=$(ffprobe -v quiet -show_entries format_tags=encoder -of default=noprint_wrappers=1:nokey=1 "$wavfile")
    album="$base_album."

    # Use lame to convert the wav file to mp3 and set the tags
    lame --ta "$artist" --tt "$title" --ty "$year" --tn "$track" \
         --tg "Game" --tv TCOM="$iwri" --tv TCOP="$copyright" \
         --tl "$album" --tv TPE2="$artist" \
         -q 0 -V 0 --noreplaygain \
         "$wavfile" "$mp3file"
    # Deleted tags
    # --tv TENC="$encoder" --tc "ISTR: $istr IFRM: $ifrm"
done