Tag editor

A tag editor is an app that can add, edit, or remove embedded metadata on multimedia file formats.

Tag editors, however, are apps dedicated to processing metadata, such as DigiKam and MusicBrainz Picard.

Their features go beyond manual editing of individual files, offering batch processing and semi-automatic content identification.

One type of tag editor compares the existing metadata in an audio file's tags with the information from online music databases, such as Gracenote, Discogs, freedb, Zortam Music Internet Database (ZMLIMD) or MusicBrainz.

In hash function, for audio identification, such as finding out whether an MP3 file matches one of a list of known items, one could use a conventional hash function such as MD5, but this would be very sensitive to highly likely perturbations such as time-shifting, CD read errors, different compression algorithms or implementations or changes in volume.