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Tau Analyzer Version 1.2 (freeware)

Reply #25
Thank you for the great reply! Now i understand more about the technique of unmasking a mp3 -> CDA. It's good to know that on this board are people who really care about audio and audio-quality and have lots of knowledge.

Tau Analyzer Version 1.2 (freeware)

Reply #26
Quote
MPC once preserved the full frequency range when you used the --braindead switch, making the visual method more or less impracticable. [{POST_SNAPBACK}][/a]


It was the --insane preset.
Then Frank Klemm created a new preset (with 0.90s encoder, something like that), which offered the same average bitrate than --insane, but with "higher quality" (e.g. without full frequency encoding -> more bits for important frequency bands).
Now, --insane and --braindead are remaped into a large scale, and none of them encode all frequencies.



EDIT: [a href="http://www.hydrogenaudio.org/forums/index.php?showtopic=1112&view=findpost&p=10409]link[/url]

Tau Analyzer Version 1.2 (freeware)

Reply #27
Quote
It was the --insane preset.
Then Frank Klemm created a new preset (with 0.90s encoder, something like that), which offered the same average bitrate than --insane, but with "higher quality" (e.g. without full frequency encoding -> more bits for important frequency bands).
Now, --insane and --braindead are remaped into a large scale, and none of them encode all frequencies.



EDIT: link
[a href="index.php?act=findpost&pid=276607"][{POST_SNAPBACK}][/a]


You're right, now i remember. And before --braindead, people even tweaked --insane cause they were still not satisfied    those were the days...

Tau Analyzer Version 1.2 (freeware)

Reply #28
I've just encountered something pretty strange. I used the command line tool and the result using -m0 was 90% probability that it's source was lossless. Anyway, I encoded that file using LAME 3.96.1 -V2 and decoded it back to wav. Now, all of a sudden that file got a probability of 95%!
--alt-presets are there for a reason! These other switches DO NOT work better than it, trust me on this.
LAME + Joint Stereo doesn't destroy 'Stereo'

Tau Analyzer Version 1.2 (freeware)

Reply #29
there seem to be even bigger issues: check out that thread: http://www.hydrogenaudio.org/forums/index....ndpost&p=286836 the provided sample is obviously lossy...looks like a typical mp3 (maybe FhG), nevertheless it's reported as 100% lossless...
--alt-presets are there for a reason! These other switches DO NOT work better than it, trust me on this.
LAME + Joint Stereo doesn't destroy 'Stereo'

Tau Analyzer Version 1.2 (freeware)

Reply #30
I've seen a few recent posts around HA in which some people seem to be surprized that the program makes errors. Well, it's true, the analyzer algorithm doesn't always work perfectly.

Even in their own testing of 5683 samples, the devs found that 2.6% of the results were inaccurate... and they make no secret of it.
Quote
Please note: Tau Analyzer does not provide an absolutely warranty in results of detection. Sometimes the program can show a wrong result for the track (please see Testing Results). Thus, to make sure you should check all of the CD contents. In this case, the program can produce more trustable CD conclusion, except some special cases.

The point that Tau Analyzer's results can't always be trusted (particularly concerning an individual track) is a good one, but it should not come as a shock to anyone. Though I suppose it's no surprize that not everyone takes the time to read the available info and become aware.

Tau Analyzer Version 1.2 (freeware)

Reply #31
I'm not on my home computer so I don't know if I have the latest version of this, but it crashes (on XP) when I try and use one of the CD drives - it's fine with the other one. I can post more information when I get home.

Probably not really relevant but it doesn't seem to be all that good at vinyl rips. It did get the right conclusion for the whole CD (i.e. no lossy digitial encoding), but on individual tracks on the 1 setting it thought roughly a third were MPEG sourced, and on the 8 setting about a half. I suppose that's inevitable though since any analogue to digital conversion is lossy in its own way.

Tau Analyzer Version 1.2 (freeware)

Reply #32
Hope someone can shed some light on a little problem. Am using XP service pack 2 and can't seem to get accurate results from the Tau 1.2 ISRC function. Each track on an audio CD (legit) is supposed to have a unique ISRC number. On the Tau query, I keep getting the same ISRC for all tracks on the CD.

Any ideas? Hope someone can help me out here....

Thanks

Tau Analyzer Version 1.2 (freeware)

Reply #33
Can someone tell me what do I do with with AuCDtect version 0.8? After unzipping the file I only see a Readme file and auCDtect. When I double click on auCDtect nothing shows up. What do I do with it?

I also downloaded Tau Analyzer version 1.2, do I have to integrate auCDtect into Tau Analyzer version 1.2?

How do I use auCDtect by itself?

Tau Analyzer Version 1.2 (freeware)

Reply #34
auCDtect is a command line app

Code: [Select]
C:\......>aucdtect -h
auCDtect: CD records authenticity detector, version 0.8.2
Copyright © 2004 Oleg Berngardt. All rights reserved.
Copyright © 2004 Alexander Djourik. All rights reserved.
------------------------------------------------------------
Usage:  auCDtect [commands/options] (track.wav|*.wav)
------------------------------------------------------------
commands:
------------------------------------------------------------
--   read data from stdin
-d   summary conclusion for set of tracks
-v   verbose mode
-h   this help
------------------------------------------------------------
options:
------------------------------------------------------------
-mS detect mode S=[0..40], default 8
0 - slow and most accurate
40 - fast, but less accurate
------------------------------------------------------------
For more information please visit: [url=http://www.true-audio.com]http://www.true-audio.com[/url]
Example
Code: [Select]
C:\....>aucdtect "Girls Of Summer.wav"
auCDtect: CD records authenticity detector, version 0.8.2
Copyright (c) 2004 Oleg Berngardt. All rights reserved.
Copyright (c) 2004 Alexander Djourik. All rights reserved.
------------------------------------------------------------
Processing file:        [Girls Of Summer.wav]
Data analysis:          [100%]
------------------------------------------------------------
This track looks like MPEG with probability 95%

Tau Analyzer Version 1.2 (freeware)

Reply #35
I see, and Tau Analyzer is the GUI version of auCDtect I suppose?

Tau Analyzer Version 1.2 (freeware)

Reply #36
I see, and Tau Analyzer is the GUI version of auCDtect I suppose?
No. Tau analyser is for a physical cd you have in your cd drive. aucdtect is for wav files.

Tau Analyzer Version 1.2 (freeware)

Reply #37
I've been looking in the wrong place the whole time. I'm searching for a program that allows you to tell if the source file was transcoded. Alot of sites I visit now have idiots who transcode 192kbps to 320kbps and think that transcoding from a lower bitrate to a higher bitrate will yield them higher quality.

I need a program that can distinguish the original source from a transcoded one.

Tau Analyzer Version 1.2 (freeware)

Reply #38
I've been looking in the wrong place the whole time. I'm searching for a program that allows you to tell if the source file was transcoded. Alot of sites I visit now have idiots who transcode 192kbps to 320kbps and think that transcoding from a lower bitrate to a higher bitrate will yield them higher quality.

I need a program that can distinguish the original source from a transcoded one.



I am in the exact situation. Tried aucdtect and now Tau. Tau won't find transcodes.

Not having much luck with aucdtect. This is the result for a LAME  -V 0 --vbr-new --add-id3v2 --ignore-tag-errors --ta "%a" --tt "%t" --tg "%m" --tl "%g" --ty "%y" --tn "%n" %s %d rip straight from CD.

Code: [Select]
auCDtect: CD records authenticity detector, version 0.8.2
Copyright (c) 2004 Oleg Berngardt. All rights reserved.
Copyright (c) 2004 Alexander Djourik. All rights reserved.
------------------------------------------------------------
Processing file:    [01 Strutter.wav]
Detected average hi-boundary frequency: 1.975749e+004 Hz
Detected average lo-boundary frequency: 1.919396e+004 Hz
Detected average hi-cut frequency: 2.001185e+004 Hz
Detected average lo-cut frequency: 1.953274e+004 Hz
Maximum probablis boundary frequency: 1.971600e+004 Hz
Coefficient of nonlinearity of a phase: 2.259359e-002
First order smothness: 9.295154e-001
Second order smothness: 7.224670e-001

------------------------------------------------------------
This track looks like MPEG with probability 95%

------------------------------------------------------------
Processing file:    [02 Deuce.wav]
Detected average hi-boundary frequency: 1.959083e+004 Hz
Detected average lo-boundary frequency: 1.883666e+004 Hz
Detected average hi-cut frequency: 1.961834e+004 Hz
Detected average lo-cut frequency: 1.902640e+004 Hz
Maximum probablis boundary frequency: 1.967900e+004 Hz
Coefficient of nonlinearity of a phase: 1.962964e-002
First order smothness: 8.863636e-001
Second order smothness: 7.000000e-001

------------------------------------------------------------
This track looks like MPEG with probability 95%



And this is the result from a Audio CD to WMA to MP3 transcode.

Code: [Select]
auCDtect: CD records authenticity detector, version 0.8.2
Copyright (c) 2004 Oleg Berngardt. All rights reserved.
Copyright (c) 2004 Alexander Djourik. All rights reserved.
------------------------------------------------------------
Processing file:    [01 Incoming.wav]
Detected average hi-boundary frequency: 1.912544e+004 Hz
Detected average lo-boundary frequency: 1.747644e+004 Hz
Detected average hi-cut frequency: 1.944789e+004 Hz
Detected average lo-cut frequency: 1.802900e+004 Hz
Maximum probablis boundary frequency: 1.845100e+004 Hz
Coefficient of nonlinearity of a phase: 4.640403e-002
First order smothness: 8.888889e-001
Second order smothness: 6.111111e-001

------------------------------------------------------------
This track looks like MPEG with probability 95%

------------------------------------------------------------
Processing file:    [02 Testimonial Year.wav]
Detected average hi-boundary frequency: 1.896774e+004 Hz
Detected average lo-boundary frequency: 1.777095e+004 Hz
Detected average hi-cut frequency: 1.927379e+004 Hz
Detected average lo-cut frequency: 1.788837e+004 Hz
Maximum probablis boundary frequency: 1.830600e+004 Hz
Coefficient of nonlinearity of a phase: 1.354178e-002
First order smothness: 8.961538e-001
Second order smothness: 6.269231e-001

------------------------------------------------------------
This track looks like MPEG with probability 95%

Tau Analyzer Version 1.2 (freeware)

Reply #39
Quote
Not having much luck with aucdtect

How that? In both your cases aucdtect showed clearly (95%) that the file didn't originate from CD but from lossy (MPEG) material...

Tau Analyzer Version 1.2 (freeware)

Reply #40
Quote
Not having much luck with aucdtect

How that? In both your cases aucdtect showed clearly (95%) that the file didn't originate from CD but from lossy (MPEG) material...

The point is not to find out if the file is lossy (we already know it is). The point is to find out if it's a lossy encode from a lossy source (from MP3 to WMA, for example, or from 192kbps MP3 to 320kbps MP3).

Tau Analyzer Version 1.2 (freeware)

Reply #41
I don't think the program was designed to work out whether an mp3 was ripped from an audio cd.
It's "advertised" function is to detect audio cd's that were made from mp3 files.

Tau Analyzer Version 1.2 (freeware)

Reply #42
I don't think the program was designed to work out whether an mp3 was ripped from an audio cd.
It's "advertised" function is to detect audio cd's that were made from mp3 files.


Agree. However the original program aucdtect supported WAV files. So if a MP3 was converted to WAV and checked with aucdtect then aucdtect will tell if the WAV file is an MPEG source or not.

 

Tau Analyzer Version 1.2 (freeware)

Reply #43
if it is a lame encoded file with proper lame headers, you can always do the mod588 check.
--alt-presets are there for a reason! These other switches DO NOT work better than it, trust me on this.
LAME + Joint Stereo doesn't destroy 'Stereo'

 
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