v1.2.3

• Safe tag writing: ffmpeg as a tagwriter limited to file types where it’s safe to use.
• Added Mutagen support. If installed, it provides support for:
  • many more file types
  • safe tag writing to the correct tags
  • Install using pip3 install mutagen (preferred), or sudo apt install python3-mutagen
• Much more error checking:
  • Command line parameters now checked for valid ranges
  • Tag writer only writes when safe, and the audio file is writable (not read-only)
  • Various file types, variants and tag formats tested on hundreds of test files.
• Help much more informative, shows:
  • better descriptions
  • whether Mutagen is installed or not
  • supported file types
  • supported and known tags
• Currently supported file types, in alphabetical order:
  • .aac, .aif, .aifc, .aiff, .alac, .ape, .asf, .flac, .m2a, .m4a, .m4b, .m4p,
    .m4r, .m4v, .mp+, .mp2, .mp3, .mp4, .mpc, .ofr, .ofs, .oga, .ogg, .ogv, .opus,
    .spx, .wav, .wma, .wmv, .wv.

Enjoy.