MP3 Tags contain many fields that aren't displayed in the MP3 viewer

[RunnerBiker]

Many ID3v2 tag fields are not displayed in the MP3 viewer.

Some examples of TEXT fields are the second and subsequent COMM (comment) fields. ID3v2 MP3 Headers are permitted to have more than one COMM field.
TLEN - Length
TMED - Media Type
WCOM - Commercial information
TXXX - User defined Text Information

Some common binary fields are:
PRIV - Private (possibly used by Windows Media Player)
UFID - Unique File ID
GEOB - General Encapsulated OBject
NCON - ????

[Erik]

Many ID3v2 tag fields are not displayed in the MP3 viewer.

Some examples of TEXT fields are the second and subsequent COMM (comment) fields. ID3v2 MP3 Headers are permitted to have more than one COMM field.
TLEN - Length
TMED - Media Type
WCOM - Commercial information
TXXX - User defined Text Information

Some common binary fields are:
PRIV - Private (possibly used by Windows Media Player)
UFID - Unique File ID
GEOB - General Encapsulated OBject
NCON - ????

FYI, we use a third party library to read the tags.

V2 tags that can be repeated (AENC, APIC, COMM, GEOB, TXXX, USLT, WXXX) are combined as a single item. If you hover over them, you should see them in the popup hint. We'll try to display this better in a future release.

GEOB, TLEN, TMED, TXXX and WCOM are all currently supported. If you have a file that should show them but doesn't, please send it to us.

The library we're using does not currently support NCON, PRIV or UFID.

[RunnerBiker]

Is there any way to display that there are other frames without identifying what they are?

Maybe the third party library just skips over them and doesn't enumerate them for you.

[Erik]

Sorry, the third party library we're using doesn't allow us to identify frames that it doesn't support.