charset in metadata comment (id3v2mux & oggmux)

[Pablo Rodríguez]

Dear list,

I have the following MP3 pipeline, which adds metadata in UTF-8 charset:

  gst-launch-1.0 autoaudiosrc ! audio/x-raw ! taginject \
  tags="title=\"αβγ\",artist=\"αβγ\",comment=\"αβγ\"" ! \
  lamemp3enc ! id3v2mux ! filesink location=test.mp3

Using VLC, I see that both title and artist are encoded fine, but
comment is displayed wrong.

With the same metadata in an Opus pipeline:

  gst-launch-1.0 autoaudiosrc ! audio/x-raw ! taginject \
  tags="title=\"αβγ\",artist=\"αβγ\",comment=\"αβγ\"" ! \
  opusenc ! oggmux ! filesink location=test.opus

VLC displays the documents just fine.

Am I missing something or have I hit a bug?

Many thanks for your help,

Pablo