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alt-preset standard problem samples, with Lame 3.93.1 and before.
post Jan 19 2002, 11:23
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There are lots of cases when alt-presets or any mp3 are not transparent, but I gather few "easy" but distorted cases which should be used to further tweak and check alt-preset standard quality.

I'll put more samples here in the future so that those are easier to find and can be found from the same place.
My intention is not to list clips with very hard attacks, other known extreme clips or clips which cause great trouble for every codec.
More like "easier" cases which in my opinion should be handled better by alt-preset standard.

Clip found by Wombat. Introduces added noise from 1.2-2sec and 4-6sec.

Although soft attacks, still introduces pre-echo hiss (most noticeable in the beginning).

Dogwhistle is chirping.

Audible distortion in the background.

In all 4 vbr presets distortion is added, mostly with the "e" when she sings "become".

Very bad distortion at about 3.5 sec.

This post has been edited by JohnV: Dec 5 2002, 09:22

Juha Laaksonheimo
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post Apr 3 2002, 11:57
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I just spent some time listening to the Birds and Liebstod samples, and it seems to me that -Z makes more of a difference, especially on Liebstod, than --ns-bass -8 does. This would basically make it another issue with noise shaping 2 then... It could probably be fixed fairly easily..

In all honestly... I think it might be better to look at nspsytune2 also, instead of just trying to hack in another tweak to the current psymodel.. I think at least that JohnV said that an early version of nspsytune2 sounded better on the Birds sample (though it also increased the bitrate a lot).
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