Seems could be fixed very easily, Debian has this patch: https://salsa.debian.org/debian/shntool/-/commit/57efcd7b34c2107dd785c11d79dfcd4520b2bc41 shntool unfortunately didn't updated since 2009, so I guess it might make sense to look and probably take other patches Debian use: https://salsa.debian.org/debian/shntool/-/tree/master/debian/patches?ref_type=heads
shntool-3.0.10-alt2 -> sisyphus: Sat Jan 17 2026 Anton Farygin <rider@altlinux> 3.0.10-alt2 - applied fixes from Debian and upstream (closes: #56802): * support WAVE_FORMAT_EXTENSIBLE in WAV parser * fix integer overflows when processing large files and long durations * allow mm:ss:ff format for non-CD-quality audio (error -> warning) * allow single input file in join mode