Unlike some programs that are designed to deal with a single topic (like fixing VBR headers or adding cover art), MP3 Diags is a one stop solution that identifies more than 50 different issues in MP3 files and provides the means to fix many of them (well, not everything is fixable; you can't make a 64kbps file sound like a 256kbps one.)
Some of the more important issues that are found:
- broken tags / headers / audio
- duplicate tags / headers
- incorrect placement of tags / headers (ID3V2, ID3V1, LAME, Xing, ...)
- low quality audio
- missing VBR header
- missing track info / cover art
- broken track info / cover art
- missing normalization data
- character encoding issues (for languages other than English)
Some of the fixes and changes that MP3 Diags can do:
- Adding / fixing track info, including album cover; information can be retrieved from several sources: Internet, clipboard, file name, local files, and (obviously) keyboard
- Correcting files that show incorrect song duration
- Correcting files in which the player cannot seek correctly
- Converting characters for non-English names
- Adding composer name to the artist field, for players that don't handle the composer field
- Renaming files based on their fields
- Changing word case for track info
Important Note:
- If you want to use those parts of MP3 Diags functionality that alter existing files, it is highly advisable to back up your files first, because there is a real chance of data loss. It can be caused by both user error and bugs in the program.