[ lame-Bugs-3084227 ] low birate compression is better with 3.96

Bugs item #3084227, was opened at 2010-10-09 03:45
Message generated for change (Comment added) made by riccardoferri
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Category: Libraries
Group: Quality
Status: Open
Resolution: None
Priority: 6
Private: No
Submitted By: tiger man (t1g3rm4n)
Assigned to: Robert Hegemann (robert)
Summary: low birate compression is better with 3.96

Initial Comment:
Hi, i\'m compressing some wavs for a website at 64 kbps and i\'ve just discovered that from lame 3.97 and following compression is worst than 3.96.1
I\'ve attached two mp3, you can clearly hear it on the kick drum, with 3.96 is equal every shot while with 3.98 it changes overtime and it addsl also a little distortion sometimes.
Hope this helps, in the meantime i keep using 3.96.1.
command line is --cbr -q 0 -b 64
thanks for reading.


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Comment By: Riccardo Ferri (riccardoferri)
Date: 2012-03-17 16:47

Message:
Hallo, i've noticed this issue also on 3.99.3, any news about it ?
Also i have a request, would it be possible to include the older algorythm
on newer lame releases, something like --cbr-old ? like you have done for
vbr?
It would be very nice as 3.96.1 is still the best encoder for cbr up to
160kbps, also the build i have was for ppc only so it doesn't works anymore
under osx 10.7 Lion. Lastly,  it's extremely slow on OSX (less than 1x with
q 0).
thanks.

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Comment By: tiger man (t1g3rm4n)
Date: 2011-07-19 18:32

Message:
i just want to add that this issue is not strictly related to this audio
file, you can hear this issue on most electronic/looped music, expecially
tracks with few sounds, where drums transients are clearly audible.

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Comment By: tiger man (t1g3rm4n)
Date: 2011-07-19 18:25

Message:
Hi, i have done more tests, with lame 3.97 and newer there are issues with
cbr encodings, while vbr are ok.
comparing this 2 command lines:

with lame 3.96.1
--cbr -b 80 -q 0 -k

with any lame newer than 3.96.1 (currently i'm using 3.98.3)
--cbr -b 80 -q 0 --highpass 0.01 --lowpass 21.00

this is to make sure that no filters will be applied on both conversions,
including resample.

as you can hear from the new attached files, conversion with the old lame
is quite good, very precise and almost all transients are reproduced fine,
while on 3.98 it's quite noticeable the loss of precision and quality.

the more you go up with kbps, the less this bad effect appears,
unfortunately it looks it totally goes away only at 192kbps, it's very rare
and barely noticeable at 160kbps.

i've attached the 2 new tests, and for file size reasons a -V 0 mp3 that
you can decode to wav in order to test by yourselves.

thanks

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Comment By: tiger man (t1g3rm4n)
Date: 2011-03-11 10:31

Message:
Hi, here's the wav, can't upload here because of file size sorry:

http://rapidshare.com/files/452074419/slice.wav

I've tried with 3.99 alpha14, in this case it looks much better than
previous versions but 3.96 is still better, on this file is barely
noticeable but please try this second wav, is the same track but in another
point:

http://rapidshare.com/files/452074437/slice2.wav

i've tried with 3.96, 3.98.4 and 3.99 alpha14 (all x86) using this command
line

lame.exe --cbr -q 0 -m s -b 80 *.wav

3.96.1 - no noticeable issues
3.98.4 - similar to 3.96 but it's less precise and sometimes it loses some
high frequencies and gives an effect like a little saturation or
"underwater"
3.99 a14 - probably the worst one, it lose a lot of high frequencies
compared to 3.96 and it seems the "underwater" effect is constantly active.

i've tried compressing at 64kbps with 3.96 and it looks like it's better
than 3.99a14 at 80kbps, it has less high frequencies but it does not have
that ugly bubbly effect.

maybe i'm missing something on the command line ?
Hope this helps and thanks for getting into it

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Comment By: Robert Hegemann (robert)
Date: 2011-03-05 06:14

Message:
Would it be possible to upload the corresponding uncompressed wave file?
Else, as current CVS has some fix for some other CBR related report, could
you try latest 3.99 alpha 14?

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