[Bug 1758537] Re: mid3v2 mangles data before adding to ID3v2 tags

[Christoph Reiter]

Thanks, that looks like a bug.

re "WXXX" vs "WXXX:" see
https://mutagen.readthedocs.io/en/latest/user/id3.html#id3-dict-
interface

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Title:
  mid3v2 mangles data before adding to ID3v2 tags

Status in mutagen package in Ubuntu:
  New

Bug description:
  I can't add frame 'WXXX' to mp3 files; mid3v2 changes the frame name
  and the frame value before writing to disk.

  What I did:

      $ mid3v2 --list-raw example.mp3
      Raw IDv2 tag info for example.mp3
      TDRC(encoding=<Encoding.LATIN1: 0>, text=[u'2018'])
      TALB(encoding=<Encoding.LATIN1: 0>, text=[u'albumname'])
      TPE1(encoding=<Encoding.LATIN1: 0>, text=[u'artistname'])
      TIT2(encoding=<Encoding.LATIN1: 0>, text=[u'songtitle'])
      $ mid3v2 -h
      ...
      You can set the value for any ID3v2 frame by using '--' and then a frame ID.
      For example:
          mid3v2 --TIT3 "Monkey!" file.mp3
      ...
      $ mid3v2 --WXXX "http://ubuntu.com/" example.mp3

  What I expected:

      $ mid3v2 --list-raw example.mp3
      WXXX(encoding=<Encoding.????: ?>, text=[u'http://ubuntu.com/'])
      or
      WXXX(encoding=<Encoding.????: ?>, url=u'http://ubuntu.com/')

  What I saw:

      $ mid3v2 --list-raw example.mp3
      WXXX(encoding=<Encoding.UTF8: 3>, desc=u'', url=u"[u'http://ubuntu.com/']")

  When I use mutagen itself to read that frame I get:

      >>> import mutagen
      >>> f = mutagen.File('example.mp3')
      >>> f.tags['WXXX']
      KeyError: 'WXXX'
      >>> f.tags['WXXX:']
      WXXX(encoding=<Encoding.UTF8: 3>, desc='', url="[u'http://ubuntu.com/']")
      >>> str(f.tags['WXXX:'])
      "[u'http://ubuntu.com/']"

  I said "WXXX" not "WXXX:", and the value that mid3v2 stored was a string
  of a one-item list of the actual string I told it to store.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: python-mutagen 1.38-1
  ProcVersionSignature: Ubuntu 4.13.0-25.29-generic 4.13.13
  Uname: Linux 4.13.0-25-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.7
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Sat Mar 24 10:42:08 2018
  Dependencies:
   
  InstallationDate: Installed on 2016-06-05 (657 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: mutagen
  UpgradeStatus: Upgraded to artful on 2017-10-22 (153 days ago)

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