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Inconsistent audiochecker results, Was: "What just happened?" (TOS #6)
eiko
post Aug 25 2008, 23:58
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OK someone ripped a CD for me.
Here was the audiochecker log results:
1 -=- 01 - Lokayatikas.flac -=- CDDA (100%)
2 -=- 02 - Kalimba.flac -=- CDDA (100%)
3 -=- 03 - Super Skunk.flac -=- CDDA (100%)
4 -=- 04 - Rakshas.flac -=- CDDA (100%)
5 -=- 05 - Bengali.flac -=- CDDA (100%)
6 -=- 06 - Kalimba (Remix).flac -=- MPEG (95%)
7 -=- 07 - Magnetic Activity (Remix).flac -=- CDDA (100%)
8 -=- 08 - Overload (Remix).flac -=- CDDA (100%)

However there were some glitchy seconds in the audio in track 3 and possibly some of the later ones, so I got sent a second rip which has no glitches.

Here is the new audiochecker log:
1 -=- 01 - Lokayatikas.flac -=- MPEG (95%)
2 -=- 02 - Kalimba.flac -=- CDDA (100%)
3 -=- 03 - Super Skunk.flac -=- MPEG (95%)
4 -=- 04 - Rakshas.flac -=- MPEG (95%)
5 -=- 05 - Bengali.flac -=- CDDA (100%)
6 -=- 06 - Kalimba (Remix).flac -=- CDDA (100%)
7 -=- 07 - Magnetic Activity (Remix).flac -=- CDDA (99%)
8 -=- 08 - Overload (Remix).flac -=- CDDA (100%)

Here is a spectral analysis of track 1 from the first rip: http://img404.imageshack.us/img404/1239/track1rip1nj9.png
Here is a spectral analysis of track 1 from the second rip: http://img174.imageshack.us/img174/6451/track1rip2nt0.png

I have no reason to suspect either rip was from mp3s & both were sent as CDImage+cue sheet. But this is not my expertise so maybe someone here can tell better what happened. I'm wondering also how one rip could have bad noise in parts and then a second rip could be OK from the same disk.

BTW this CD is from 1996 it is plausible to think it would have shitty quality in the first place.

Thoughts anyone? blink.gif

This post has been edited by eiko: Aug 26 2008, 00:00
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pdq
post Aug 26 2008, 13:59
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Tell your friend to use a secure ripper. Even the tracks in which you don't hear any problems may still have been ripped inaccurately.

Instead of running audiochecker on the files, do a bit comparison to see if they are identical. If audiochecker shows inconsistent results on identical files then that would be interesting.
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eDio
post Feb 10 2009, 18:26
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eiko
Maybe it's too late for reply, but I tried to dig something about audiochecker and found this post.

On the first image strange shelf is visible on highest frequencies. This may be a result of resampling (f.ex. track ripped as 48000 Hz).

And now I see the same on the second image.
Try to use some trustworthy ripper as EAC or if you like something more userfriedly - dBPowerAmp.
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fredhammersmith
post Dec 5 2009, 19:30
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I tested Audiochecker on my own CDs, ripped with EAC with the slow and reliable methodology (Test in Burst Mode, then Copy in Secure Mode)...
and I had very inconsistent results on classical music.

- audiochecker was not able to determine the source of the very famous Glenn Gould's Goldberg Variations (a very early CD)
- a DG compilation of Emil Gilel's Beethoven recordings was 100% MPEG !!! (solo piano again)
- a Jando's Naxos recording, piano solo again: 100% MPEG
- a Louis Lortie recording: could not determine the source (again, piano solo)
- the very famous Arturo Benedetti's Debussy: 80% MPG.

At this point, we can say, for sure, that audiochecker is not reliable with piano solo.

More troubling:

John Taverner Innocence, 5th track: 100% MPEG... Choral...

So I don't think we can rely on that kind of analysis to find out about the source of digital files.
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greynol
post Dec 7 2009, 05:13
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Did you try aucdtect.exe configured at its highest level of accuracy?


--------------------
I should publish a list of forum idiots.
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fredhammersmith
post Dec 7 2009, 09:51
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QUOTE (greynol @ Dec 6 2009, 23:13) *
Did you try aucdtect.exe configured at its highest level of accuracy?


No. I don't know this one, I'll try it, thanks.
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