LAME 3.93.1 vs 3.90.3 Options

[ye110man]

LAME 3.93.1 using --preset standard -Z: 6,563,619 bytes
LAME 3.90.3 using --alt-preset standard (-Z is default): 6,775,038 bytes

why? is there a quality difference?

[Dibrom]

Hm... the presets are optimized for 3.90.2 and because of different routines 3.93.1 uses they'll probably result in bad quality.

hmm. probability is just a guess, too.

formerly gabriel stated that the alt-presets shouldn't be affected by the changes (by design).

I don't see, why we shouldn't believe in that, until the contrary is proven.

The alt-presets can seen to be affected by the simple fact that the resulting bitrate differs between the two rounding modes. This will affect quality on some level. The question is whether it is detectable or not, and how often.

I don't know where Gabriel made this statement, or why (or even if -- I don't remember seeing this at least), but it's incorrect and misleading.

Also, as I've stated in the past, I have heard a difference between using an ICL compile (with the rounding mode I tuned for) vs. an MSVC compile (with a rounding mode I didn't tune for) in at least one case. The chance for there to be more differences certainly is very real.