然后使用mid3iconv工具

Usage: mid3iconv [OPTION] [FILE]...
Mutagen-based replacement the id3iconv utility, which converts ID3 tags from
legacy encodings to Unicode and stores them using the ID3v2 format.

Options:
  --version             show program's version number and exit
  -h, --help            show this help message and exit
  -e ENCODING, --encoding=ENCODING
                        Specify original tag encoding (default is UTF-8)
  -p, --dry-run         Do not actually modify files
  --force-v1            Use an ID3v1 tag even if an ID3v2 tag is present
  --remove-v1           Remove v1 tag after processing the files
  -q, --quiet           Only output errors
  -d, --debug           Output updated tags

將MP3的TAG編碼轉換成GBK編碼，亂碼原因是windows下一般MP3的TAG編碼為GB2312.