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The previous fix for orphaned chapter mdats assumed the chapter text mdat was dedicated and derived its location from stco[0] - 8. In audiobooks that co-locate chapter text at the start of the primary audio mdat (stco[0] == audioMdat.offset + 8), that arithmetic lands on the audio mdat header, the "mdat" signature check passes, and the full audio payload gets removed -- shrinking a 484 MB audiobook to 5.4 MB. Fix: resolve the chapter mdat by finding the top-level mdat whose data range contains stco[0], then re-parse after the trak/tref removals and confirm no other track's stco/co64 points into that mdat before deleting it. Shared mdats are left intact; the dead chapter text bytes remain as harmless padding. Add a regression test that writes a chapter track, patches its stco[0] to point into the primary audio mdat (simulating the audiobook layout), removes the chapter track, and verifies the audio mdat is byte-identical afterwards.
TagLib
TagLib Audio Metadata Library
TagLib is a library for reading and editing the metadata of several popular audio formats. Currently, it supports various metadata containers such as ID3v1, ID3v2 and Vorbis comments for MP3, MP4, AAC, Ogg, Opus, FLAC, Speex, APE, MPC, WavPack, WAV, AIFF, TrueAudio, Matroska, WebM, ASF, WMA, DSF, DFF and tracker (MOD, XM, S3M, IT) files.
TagLib is distributed under the GNU Lesser General Public License (LGPL) and Mozilla Public License (MPL). Essentially that means that it may be used in proprietary applications, but if changes are made to TagLib they must be contributed back to the project. Please review the licenses if you are considering using TagLib in your project.