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alt-preset standard problem samples, with Lame 3.93.1 and before.
JohnV
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.

http://static.hydrogenaudio.org/extra/samp...es/sophia2.flac
Clip found by Wombat. Introduces added noise from 1.2-2sec and 4-6sec.

http://static.hydrogenaudio.org/extra/samp.../vangelis1.flac
Although soft attacks, still introduces pre-echo hiss (most noticeable in the beginning).

http://static.hydrogenaudio.org/extra/samp...dogwhistle.flac
Dogwhistle is chirping.

http://static.hydrogenaudio.org/extra/samp.../liebestod.flac
Audible distortion in the background.

http://static.hydrogenaudio.org/extra/samp...ples/birds.flac
In all 4 vbr presets distortion is added, mostly with the "e" when she sings "become".

http://static.hydrogenaudio.org/extra/samp...mples/erhu.flac
Very bad distortion at about 3.5 sec.

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


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Dibrom
post Apr 3 2002, 09:56
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QUOTE
Originally posted by Gabriel
I'm starting to believe that the new ATH I introduced have a too low sensitivity in the low freq area.
This needs to be confirmed, but if confirmed the cure will be easy.


This could be possible, though I'd be a bit surprised if it was solely related to the ATH. Though, if it is, it should be easy to test just by using --athlower..
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