Did you keep each generation of file created along the way?  By my count
you should have the original plus about 14 more.  If you decode each of
these to a WAV file, the WAV files should be identical.  That's a much
more important test than what you're doing.  Having any metadata in the
files complicates things, as there may be padding that gets added or
removed each time you encode or decode.

Going from FLAC to ALAC, it's not unusual that you'd see a small
decrease in file size, as ALAC may compress better than FLAC using the
default compression level.  It's known that FLAC doesn't always milk the
very last amount of compression from a file, in exchange for being a
relatively fast, lightweight CODEC that is even faster on the decoding
side (asymmetric in favor of decoding speed).

I'd be willing to bet that if you decoded and encoded using just FLAC
for several generations that after one or two the file size wouldn't
change.  ALAC may be less predictable in what it does with metadata.


-- 
JJZolx

Jim
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