[Icecast] Errors when streaming with EZStream

[Steve Matzura]

I get a mail message when certain files are streamed with EZStream.
The mail messages consist of several copies of the following two
lines:

TagLib: String::copyFromUTF8() - Unicode conversion error.
TagLib: ID3v2.4 no longer supports the frame type TDA.  It will be
discarded from the tag.

How should the files be tagged to prevent these informational warnings
and thus the mail messages?