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New Problematic sample!!!
[JAZ]
post Jul 8 2002, 22:41
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I've encountered a sample that fulminates lame at any preset ( and I mean ANY, even --alt-preset insane).

http://www.terra.es/personal4/jas00010/fil...we32-20sec.flac

(try http://jaz.project-psy.com/files/awe32-20sec.flac if the other one doesn't work)

The sample comes from a self-made song (with virtual instruments), where I use chorusing. LAME produces noise in there. --alt-preset insane is nearly acceptable, but can be ABX'd (haven't tried to).
Using --alt-preset standard, the noise is more hearable, and I'm sure that anyone can hear it with -b 128

Note: I used Headphones, because it's at night. Maybe with speakers the noise is not as evident.

(As a reference, vorbis pre-rc4 with -q 5 (~160kbps) doesn't have this problem)
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[JAZ]
post Jul 16 2002, 20:41
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This might seem a joke, but I've been able to abx 29 out of 33 (0.001) the freeformat 640 against the original. but probably 99.995% of people wouldn't get it.
I can't really describe the difference, it was a sutble change in the chorus in one concrete part. Original seemed clean, while mp3 seemed not that clean.

Since the problem was noticeable at another part, it might not be related.

Only MPC passes the test as of right now ( with --standard, 242kbps file)

(Thanks Citay, again. you know why ;) )


Edit:

Due to request, the list of codecs and settings tried:

LAME
--alt-preset standard: Not tried to abx. it's just too evident. || Quality : 2.3 (annoying)
--alt-preset insane: Not tried to abx. Less evident, but still. || Quality : 2.7 (annoying)
--alt-preset insane --freeformat -b 640 : abx 29 of 33 || Quality : 4.6 (slighly perceptible. not annoying)
--freeformat -b 640 -m s : Can't abx

Fraunhoffer (the one with nero, disabling the mp3pro capability, intensity stereo and resampling)
high quality -b320 : Not tried to abx. Evident too. || Quality : 2.8 (annoying)

ABX between --alt-preset insane and fraunhoffer -b320 : 46 out of 60 (0.001)
(JohnV points that not using --nspsytune in this sample would help)


Vorbis 1.0
-q3 : abx 20 of 20 || Quality : 2.7 (annoying)
-q6 : abx 18 of 22 || Quality : 3.8 (slightly annoying)
-q7 : abx 12 of 22 == Guessing
-q7 (with a more complex part) : abx 20 of 22 || Quality : 4.2 (perceptible, but not annoying)
-q8 : abx 12 out of 22 = Guessing (even with the more complex part)

Musepack 1.06

--standard : Can't abx, not even the complex part.
bitrates : whole song : 242kbps
most complex part : 292kbps

Quicktime 6 MP4

-192kbps : Not tried to abx || Quality : 1.5 ( Sounds coming from a scratched vinyl)
-256kbps : Not tried to abx || Quality : 3.2 ( Sounds fine, but there are still some scratches)

Psytel AACenc
312kbps (encoded by wild_board) : abx : 20 of 25 || Quality : 4.8 (Slightly perceptible)
Archive ( 242kbps ) : can't abx


Edit : Quality numbers are a bit relative... not really exact.
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Posts in this topic
- [JAZ]   New Problematic sample!!!   Jul 8 2002, 22:41
- - Wombat   Congrats [JAZ] !! you found the first sample that...   Jul 8 2002, 23:31
- - Seed   [JAZ], I beg to differ. Vorbis pre RC4 CVS from Ju...   Jul 10 2002, 06:57
- - [JAZ]   Yes Seed, you're right. I didn't listened carefull...   Jul 10 2002, 09:44
- - plazz   What song is this?   Jul 10 2002, 18:22
- - Slo Mo Snail   Maybe you should read it again QUOTE The sample ...   Jul 10 2002, 18:45
- - [JAZ]   The song is avaiable in original form ( .psy forma...   Jul 10 2002, 21:31
- - rts   QUOTE Originally posted by [JAZ] I've encountered...   Jul 12 2002, 23:43
- - smok3   12/16 (p=0.038) = abxed | - lame 3.92 --alt-preset...   Jul 13 2002, 02:56
- - [JAZ]   QUOTE Originally posted by rts I tested with la...   Jul 14 2002, 10:14
- - Tom Servo   Vorbis 1.0 at -q 3 did compress it flawlessly (avg...   Jul 14 2002, 15:59
- - [JAZ]   Due to curiosity, I've checked the Frequency (spec...   Jul 14 2002, 20:25
- - CiTay   Moved OT discussion to http://www.hydrogenaudio.or...   Jul 15 2002, 23:14
- - [JAZ]   Attention. This sample might show a limitation in ...   Jul 16 2002, 19:29
- - treech   Damn, i can't ABX it at 320 ... :=) try freeforma...   Jul 16 2002, 19:56
- - Tom Servo   Heh, not to be offtopic, but would be bitrates at ...   Jul 16 2002, 19:59
- - treech   Just for fun i guess :diabolic:   Jul 16 2002, 20:02
- - [JAZ]   This might seem a joke, but I've been able to abx ...   Jul 16 2002, 20:41
- - JohnV   QUOTE Originally posted by [JAZ] This might seem ...   Jul 17 2002, 00:15


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