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Topic: 32kbps public listening test - OPEN (Read 57009 times) previous topic - next topic
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32kbps public listening test - OPEN

Hello.
I'd like to announce the launch of my 32kbps dial-up bitrate listening test

The formats featured are Nero Digital Audio (HE-AAC+PS), Ogg Vorbis, WMA9 Std., MP3pro, Real Audio and QDesign Music Codec.
Lame MP3 is being used as low anchor, and a lowpass at 7kHz is being used as high anchor.

For further information on how to participate, visit the test announcement page:
http://www.rjamorim.com/test/32kbps/presentation.html

The test is scheduled to end at July 11th.

Thank-you very much.
Best regards;
Roberto Amorim.

32kbps public listening test - OPEN

Reply #1 –
the faad version for OS X on rarewares appears to decode the HE-AAC samples to mono files. Well I only tested the new york one but it was the case there.

32kbps public listening test - OPEN

Reply #2 –
Quote
the faad version for OS X on rarewares appears to decode the HE-AAC samples to mono files. Well I only tested the new york one but it was the case there.

Isn't mono the best alternative for such low bitrates?
---

32kbps public listening test - OPEN

Reply #3 –
Maybe, but the test was HE-AAC+PS, and PS is useless on a mono file by definition, so I doubt the samples were mono.

32kbps public listening test - OPEN

Reply #4 –
Please make sure the files are decoded with recent FAAD2 on all platforms as there have been updates/bugfixes to HE-AAC decoding.

No recent version of FAAD2 should give mono output on *any* file BTW.

32kbps public listening test - OPEN

Reply #5 –
Hrm... I guess RareWares needs an updated compile of Faad.

Can any Mac user contribute one?

32kbps public listening test - OPEN

Reply #6 –
The torrents seem to be flowing well  Are you going to bother sending the word out to the unwashed masses at Slashdot et al?  50gbs of bandwith leeched for ~0 participants seemed futile last time round
< w o g o n e . c o m / l o l >

32kbps public listening test - OPEN

Reply #7 –
Quote
Are you going to bother sending the word out to the unwashed masses at Slashdot et al?  50gbs of bandwith leeched for ~0 participants seemed futile last time round

Might be worth it. But I don't think they would be interested in a 32kbps test. And, of course, we would se hundreds of posts there claiming such low bitrates are useless, yadda yadda.

Atill, it could bring some participants. I would be grateful if someone could post the news there.

32kbps public listening test - OPEN

Reply #8 –
(off topic ?)
As a newcomer to listening tests (my first ! ), I fear my comments will miss some technical vocabulary - what about a library of audio artifacts with 'technical' terms associated ? 
Anyway such a test seems interesting and promising. Thx !
Newborn MPC, Matroska and Foobar enthusiast.
Thanks to all the authors and developers =)

32kbps public listening test - OPEN

Reply #9 –
For that matter, is full 44 khz stereo necessary at 32 kbps? If I were streaming 32 kbps, in the interest of quality I would probably downsample to 22khz mono, or even 11 khz mono.

32kbps public listening test - OPEN

Reply #10 –
Quote
For that matter, is full 44 khz stereo necessary at 32 kbps? If I were streaming 32 kbps, in the interest of quality I would probably downsample to 22khz mono, or even 11 khz mono.

Only Nero AAC uses full 44.1kHz

All other codecs had the samples downsampled for encoding, and later upsampled for comparision on ABC/HR

The reason of upsampling is working around crappy sound card resamplers, that would bias the test.

32kbps public listening test - OPEN

Reply #11 –
I did 4 samples tonight. They are rather easy to do because you don't have to strain to differentiate between the sample and the reference. The results should be very interesting.

32kbps public listening test - OPEN

Reply #12 –
Downloaded everything and have it all unzipped an ready to go, but I'm holding off on it right now because I'm sleepy  I'll be pretty worried though if I can't tell 32kbps files from the source lol.  Seriously I am looking forward to the testing.
Nero AAC 1.5.1.0: -q0.45

32kbps public listening test - OPEN

Reply #13 –
I shouldn't be surprised, but harashin again finished the entire sample set first. This time in less than 12 hours after the test start.

32kbps public listening test - OPEN

Reply #15 –
I haven't been keeping up with this test but can someone tell me why HE-AAC with PS is being used, MP3 Pro but only WMA standard is being used not Pro? doesn't seem fair to me

32kbps public listening test - OPEN

Reply #16 –
Quote
but only WMA standard is being used not Pro? doesn't seem fair to me
Because the Pro-codec doesn´t work with low bitrates, AFAIK only >= 128 kbps.

32kbps public listening test - OPEN

Reply #17 –
For the Unix enthusiasts, create theses scripts in the bin directory of the test (!! case sensitive !!):

Samplexx.sh
Code: [Select]
flac -d -o $1.wav $1.flac

oggdec $1_2.ogg
mv $1_2.wav $1_2a.wav

faad -o $1_5.wav $1_5.mp4
madplay --output=wave:$1_1a.wav $1_1.mp3

flac -d -o $1_3.wav $1_3.flac
flac -d -o $1_6.wav $1_6.flac
flac -d -o $1_7.wav $1_7.flac
flac -d -o $1_8.wav $1_8.flac

sox $1.wav $1_4.wav filter 0-7000

ssrc --rate 44100 --twopass $1_1a.wav $1_1.wav
ssrc --rate 44100 --twopass $1_2a.wav $1_2.wav

# Cleanup
rm $1.flac
rm $1_1.mp3
rm $1_2.ogg
rm $1_3.flac
rm $1_5.mp4
rm $1_6.flac
rm $1_7.flac
rm $1_8.flac
rm $1_1a.wav
rm $1_2a.wav


Sample.sh
Code: [Select]
sh Samplexx.sh ../Sample01/Bartok_strings2
sh Samplexx.sh ../Sample02/chanchan
sh Samplexx.sh ../Sample03/Debussy
sh Samplexx.sh ../Sample04/female_speech
sh Samplexx.sh ../Sample05/getiton
sh Samplexx.sh ../Sample06/Hongroise
sh Samplexx.sh ../Sample07/kraftwerk
sh Samplexx.sh ../Sample08/Leahy
sh Samplexx.sh ../Sample09/male_speech
sh Samplexx.sh ../Sample10/Mama
sh Samplexx.sh ../Sample11/NewYorkCity
sh Samplexx.sh ../Sample13/rosemary
sh Samplexx.sh ../Sample12/OrdinaryWorld
sh Samplexx.sh ../Sample14/SinceAlways
sh Samplexx.sh ../Sample15/TomsDiner
sh Samplexx.sh ../Sample16/trust
sh Samplexx.sh ../Sample17/Twelve
sh Samplexx.sh ../Sample18/Waiting


And run with
Code: [Select]
sh Sample.sh

32kbps public listening test - OPEN

Reply #18 –
Please make sure that for Unix tests  you use latest FAAD2 (www.audiocoding.com) - otherwise some strange things could happen

32kbps public listening test - OPEN

Reply #19 –
From my gentoo, the ebuild is "media-libs/faad2".

Code: [Select]
$ faad

 *********** Ahead Software MPEG-4 AAC Decoder V2.0      ******************

 Build: Jun 15 2004
 Copyright 2002-2004: Ahead Software AG
 http://www.audiocoding.com
 Floating point version

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

 **************************************************************************
...

32kbps public listening test - OPEN

Reply #20 –
Quote
From my gentoo, the ebuild is "media-libs/faad2".

Code: [Select]
$ faad

 *********** Ahead Software MPEG-4 AAC Decoder V2.0      ******************

 Build: Jun 15 2004

....

I prefer if a version build from yesterdays checkin would be used. But this should not give any big problems.

Menno

32kbps public listening test - OPEN

Reply #21 –
To all extra-lazy windows users who downloaded the "all samples" package and don't want to execute those sampleXX.bat files one by one:

I made a batch file for converting all samples at once, just download it to your test/bin directory and execute it (of course all sampleXX.zip files must have been extracted to test/SampleXX before).

download link

Regards, fileman.
 

32kbps public listening test - OPEN

Reply #22 –
Finished all 18 samples.

Results submitted.

G'night everybody.

32kbps public listening test - OPEN

Reply #23 –
likewise and good day/evening.

32kbps public listening test - OPEN

Reply #24 –
Quote
For the Unix enthusiasts, create theses scripts in the bin directory of the test (!! case sensitive !!):

I added your scripts to abc-hr_bin.zip. Hope you don't mind.

Thank-you very much.

Regards;

Roberto.