PerfectTUNES corrupting tags

[x64940]

Problem Summary

PerfectTUNES ID Tags corrupts custom 'CDTOC' metadata tags when editing any tag in FLAC files that contain pre-existing CDTOC data.

Environment

• Software: PerfectTUNES ID Tags (companion to dBpoweramp CD Ripper)
• File Format: FLAC
• OS: macOS Version 15.3.2 (Build 24D81)
• dBpoweramp Version: RRelease 2025-05-04

Steps to Reproduce

1. Create FLAC files using dBpoweramp CD Ripper
2. Add custom metadata tags via 'metaflac':
   • CDTOC (CD Table of Contents data)
3. Open the FLAC file in PerfectTUNES ID Tags
4. Edit any tag (e.g., correct artist name, add genre, etc.)... doesn't have to be the CDTOC tag
5. Save changes

Expected Behavior

All existing metadata tags should be preserved unchanged when editing unrelated tags.

Actual Behavior

The CDTOC tag value is corrupted from a valid format to '1+96+96'.

Before PerfectTUNES editing:

CDTOC=1 14 202 18080 45152 69462 98392 124450 132797 149280 173482 194427 224755 243820 253920 279670 314917

% metaflac --show-all-tags './Joe Satriani/Time Machine, Disc 2/05 The Crush Of Love.flac'
...
CDTOC=1 14 202 18080 45152 69462 98392 124450 132797 149280 173482 194427 224755 243820 253920 279670 314917
...

After PerfectTUNES editing:

CDTOC=1+96+96

% metaflac --show-all-tags './Joe Satriani/Time Machine, Disc 2/05 The Crush Of Love.flac'
...
CDTOC=1+96+96
...

Impact

• Data Loss: Valid CD table of contents information is destroyed
• Database Linking: CDDB and MusicBrainz disc identification becomes impossible
• Silent Corruption: No error message alerts user to the data loss

Additional Notes

• This is reproducible on numerous FLAC files.
• The 1+96+96 appears to be a placeholder/default value rather than random corruption

Suggested Fix

• PerfectTUNES should preserve all existing metadata tags that are not being explicitly edited, especially custom/non-standard tags that may be used for library management and disc identification purposes.
• Writes should be verified and an error raised when the user input != data written.

[PeterP]

Thanks for the bug report.

Note that PerfectTUNES is a separate application from dBpowereamp. What version of PerfectTUNES are you using?

[PeterP]

Update-

I have managed to reproduce this bug using dBpoweramp R2025-05-04 "Edit Tags". I assume PerfectTUNES versions older than June 2025 exhibit the same behavior.

This bug was fixed since, latest version of both dBpoweramp and PerfectTUNES no longer do this.