mutagen updates an existing v1 tag on save - it normalised the genre
byte 0xFF to 0x0F on Shamrocks and Shenanigans and the guard refused a
whole album of good rewrites over one metadata byte. The v1 block is
metadata, not audio; the guard now hashes strictly the frames between
the v2 tag and any trailing TAG block.
A tagger that writes a non-standard size field puts the header claim and
the real tag end in different places. mutagen preserves audio from where
it parsed the tag to end; the guard hashed from where the header claimed,
and refused good rewrites across a whole album. Both hashes now use the
same authority. Failed files stay untouched and a re-run picks them up.
iOS AVPlayer reads a streamed file head in ~32 KB range requests and cannot
reach audio until it is past the ID3 tag - a 955 KB embedded JPEG cost ~30
sequential round trips, a two-second silence Android never feels. 28% of the
library (20,487 files, 1,488 albums) carries art that size.
Keeps an embedded front cover (other users of these files see it) but at
600px/JPEG stepped to fit 80 KB, ~3 chunks. Audio region is hashed before
and after; any mismatch keeps the original. Rescues art to cover.jpg first
when the folder has none.
pastilhas