Re: [LAU] ABX test invite

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To: Peder Hedlund <peder@...>
Cc: LAU <linux-audio-user@...>
Date: Friday, April 5, 2013 - 5:26 am

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So here is the thing, it makes a large difference what the source is as to
how obvious it would be. Case in point, I found the v6 difficult on the
files in the thread, but I toss in one of my recordings(Using lame with v4
and v6 as above) from a live concert and holy crap is there a difference,
obvious right from the get go in the hiss in the track on v6. v4 on the
other hand was very difficult to tell on that track to where I don't think
I could hear a difference. But that only makes me wish I had some decent
recording of full orchestral classical at my workstation to listen to as
that is my goto material for a source. Or irish folk music, which can do a
decent job as well causing problems of more than one sort:)

Some things to keep in mind, I am listening over studio monitors, not
headphones, but still much better than the average listening environment.
It would likely be even more obvious over headphones to tell the truth.
Second it always makes a difference in the second generation encoding,
which is why I tend to use FLAC for archival and master purposes, and use
OGG or otherwise for listening, so that I never risk a second generation
compression, which becomes more obvious.

Via abx, there wasn't ever a question with v8 really. v6 as I mentioned on
the sources mentioned above were much harder, but if I tossed in my own
acoustic/folk recording it became very blatant. Again source makes all the
difference. v4 I couldn't tell over speakers, but I also don't have most
of my music collection here either, so I really should come back to it with
some decent classical and irish folk tracks and see what happens.

Seablade

On Wed, Apr 3, 2013 at 3:06 PM, Peder Hedlund wrote:

> Quoting Peder Hedlund :

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So here is the thing, it makes a large diff=
erence what the source is as to how obvious it would be.=A0 Case in point, =
I found the v6 difficult on the files in the thread, but I toss in one of m=
y recordings(Using lame with v4 and v6 as above) from a live concert and ho=
ly crap is there a difference, obvious right from the get go in the hiss in=
the track on v6.=A0 v4 on the other hand was very difficult to tell on tha=
t track to where I don't think I could hear a difference.=A0 But that o=
nly makes me wish I had some decent recording of full orchestral classical =
at my workstation to listen to as that is my goto material for a source.=A0=
Or irish folk music, which can do a decent job as well causing problems of=
more than one sort:)
Some things to keep in mind, I am listening over studio monitors,=
not headphones, but still much better than the average listening environme=
nt.=A0 It would likely be even more obvious over headphones to tell the tru=
th.=A0 Second it always makes a difference in the second generation encodin=
g, which is why I tend to use FLAC for archival and master purposes, and us=
e OGG or otherwise for listening, so that I never risk a second generation =
compression, which becomes more obvious.
Via abx, there wasn't ever a question with v8 really.=A0 v6 a=
s I mentioned on the sources mentioned above were much harder, but if I tos=
sed in my own acoustic/folk recording it became very blatant.=A0 Again sour=
ce makes all the difference.=A0 v4 I couldn't tell over speakers, but I=
also don't have most of my music collection here either, so I really s=
hould come back to it with some decent classical and irish folk tracks and =
see what happens.
=A0=A0=A0=A0=A0=A0=A0 SeabladeOn Wed, Apr 3, 2013 at 3:06 PM, Peder Hedlund <ped=
er@musikhuset.org
> wrote:
Quoting Peder Hedlund <=
peder@musikhuset.=
org
>:

In view of the recent debate regarding the alledged "crappiness" =
of MP3
I thought it would be fun to see if the LAU society can tell lame
(v3.99.4) MP3s from the original.

Everyone is invited to download the testfiles from
ht=
tp://www.musikhuset.org/~peder/AxelF.zip
, see if you can ABX th=
em
and post the result.

I actually surprised myself regarding the 124 kbps sample :

trials 10

against 165: correct 5, p-value 0.623
against 124: correct 10, p-value 0.000977
against 108: correct 10, p-value 0.000977

Tested using Sennheiser HD 280 pro headphones.

A hint for testing is to have the sound start playing at 5s and listen to t=
he "warble". At around 8s there's a distinct flaw that also s=
ticks out.

One drawback in using the ABX Tester from http://phintsan.kapsi.fi/abx.html=
is that it's not double blind since you know which file is A and which=
is B.

I think the foobar2000 ABX plugin randomizes this at startup.
But then again, once you've figured out what to listen for you hear it =
pretty much instantly, if you *can* hear it.

- Peder
_______________________________________________
Linux-audio-user mailing list
=
Linux-audio-user@lists.linuxaudio.org

http://lists.linuxaudio.org/listinfo/linux-audio-user

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Messages in current thread:
[LAU] ABX test invite, Peder Hedlund, (Wed Apr 3, 11:01 am)
Re: [LAU] ABX test invite, James Stone, (Fri Apr 5, 7:27 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Fri Apr 5, 11:24 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Fri Apr 5, 9:48 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Fri Apr 5, 9:43 pm)
Re: [LAU] ABX test invite, Fons Adriaensen, (Fri Apr 5, 10:50 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Sat Apr 6, 12:44 am)
Re: [LAU] ABX test invite, Peder Hedlund, (Sat Apr 6, 1:03 am)
[LAU] Definition of "sound quality", Ralf Mardorf, (Sat Apr 6, 2:32 am)
Re: [LAU] Definition of "sound quality", Charles Z Henry, (Sat Apr 6, 2:14 pm)
Re: [LAU] Definition of "sound quality", Ralf Mardorf, (Sat Apr 6, 1:19 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Sat Apr 6, 1:22 am)
Re: [LAU] ABX test invite, Peder Hedlund, (Wed Apr 3, 7:07 pm)
Re: [LAU] ABX test invite, Thomas Vecchione, (Fri Apr 5, 5:26 am)
Re: [LAU] ABX test invite, Raffaele Morelli, (Fri Apr 5, 6:26 am)
Re: [LAU] ABX test invite, Peder Hedlund, (Fri Apr 5, 9:02 am)
Re: [LAU] ABX test invite, Thomas Vecchione, (Fri Apr 5, 11:44 am)
Re: [LAU] ABX test invite, Ralf Mardorf, (Fri Apr 5, 1:50 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Fri Apr 5, 2:57 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Fri Apr 5, 6:11 pm)
Re: [LAU] ABX test invite, Felix Homann, (Sat Apr 6, 7:24 am)
Re: [LAU] ABX test invite, Ralf Mardorf, (Sat Apr 6, 8:53 am)
Re: [LAU] ABX test invite, Peder Hedlund, (Sat Apr 6, 12:01 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Sat Apr 6, 1:06 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Sat Apr 6, 1:56 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Fri Apr 5, 11:51 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Sat Apr 6, 1:43 am)
Re: [LAU] ABX test invite, Ralf Mardorf, (Sat Apr 6, 1:42 am)
Re: [LAU] ABX test invite, Chris Bannister, (Sat Apr 6, 12:05 pm)
Re: [LAU] ABX test invite, Florian Paul Schmidt, (Fri Apr 5, 2:03 pm)
Re: [LAU] ABX test invite, Thomas Vecchione, (Fri Apr 5, 5:06 pm)
[LAU] Fair use laws - Was: ABX test invite, Ralf Mardorf, (Fri Apr 5, 2:11 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Fri Apr 5, 12:43 pm)
Re: [LAU] ABX test invite, Thomas Vecchione, (Fri Apr 5, 5:05 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Fri Apr 5, 5:46 pm)
Re: [LAU] ABX test invite, Paul Davis, (Fri Apr 5, 12:20 pm)
Re: [LAU] ABX test invite, Thomas Vecchione, (Fri Apr 5, 5:04 pm)
Re: [LAU] ABX test invite, Raffaele Morelli, (Wed Apr 3, 11:55 am)
Re: [LAU] ABX test invite, Ralf Mardorf, (Wed Apr 3, 12:42 pm)
Re: [LAU] ABX test invite, James Stone, (Wed Apr 3, 3:14 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Wed Apr 3, 4:11 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Wed Apr 3, 1:28 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Wed Apr 3, 1:35 pm)
Re: [LAU] ABX test invite, Ralf Mardorf, (Wed Apr 3, 3:25 pm)
Re: [LAU] ABX test invite, Peder Hedlund, (Wed Apr 3, 12:29 pm)
Re: [LAU] ABX test invite, Raffaele Morelli, (Wed Apr 3, 12:40 pm)