What are the internal switches of Alt presets? Options

[Oge_user]

Hello to all.
Using the alt preset(s) in the Lame 3.92, i must say that
"alt preset 128 cbr" make a good job avoiding common problems
at this bitrate.
Can someone explain the internal switches or commands used by
alt preset 128 and alt preset insane?
And, if possible, the meaning?

[Kitanai]

Thanks for the warm welcome

I am going to backup my CD collection and I would like to do so in very high quality - however, CBR 320 seems overkill to me. So I go for the tested LAME 3.90.3 and --alt-preset extreme.

I tried later versions with VBR and q=0. My question is, how --alt-preset extreme in 3.90.3 compares to 3.96.1 and the setting -v -V 0 -q 0 ?

[timcupery]

I am going to backup my CD collection and I would like to do so in very high quality - however, CBR 320 seems overkill to me. So I go for the tested LAME 3.90.3 and --alt-preset extreme
I tried later versions with VBR and q=0. My question is, how --alt-preset extreme in 3.90.3 compares to 3.96.1 and the setting -v -V 0 -q 0 ?

@Kitanai: First, there's no need to specify -v when you're already specifying -V0 (which is equivalent to --preset extreme, as it seems you've already discovered).
Second, I (and most others in these forums) would recommend against specifying a different -q value when already specifying a preset VBR setting. The people who set these up know what they're doing, and specifying -q 0 isn't going to improve the encode. More generally, even if you're designing your own commandline switch, -q0 might not be the way to go... the Lame helpfile says the following:

-q 0 and -q 1 are slow and may not produce significantly higher quality

Finally, the -V settings weren't implemented until 3.95, so -V0 won't work in 3.90.3, or at least it won't get you the equivalent of --preset extreme.

Most people on here would recommend that you use 3.97a11 -V0 --vbr-new (a.k.a. --preset fast standard) which will probably be slightly better in quality - and a whole lot faster - than Lame 3.90.3 --preset extreme. Lame 3.90.3 was specifically optimized for --preset standard, and is still recommended specifically for that switch, because it's been tested so much. (Even so, 3.96.1 is used by more people, and 3.97a11 used by even more people and has tested extremely well when using the --vbr-new switch.)