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An experiment in lossy vs lossless A/B testing

post #1 of 51
Thread Starter 

Everyone is encouraged to join in. Grab the two WAV clips in the next post and use foobar2000's ABX Comparator component to see if you can consistently match them up. Then post your ABX log and your guess as to which file is the lossless copy. Take your time, the more tests you can include in your log the better.

 

foobar2000 ABX Comparator component: http://www.foobar2000.org/components/view/foo_abx


Edited by devhen - 2/8/13 at 6:23pm
post #2 of 51

A: http://www.mediafire.com/download.php?hwqs7ff24lntg3p

B: http://www.mediafire.com/download.php?yn3fo363trk6kwb


Edited by chewy4 - 2/8/13 at 4:01pm
post #3 of 51

Excellent, thank you! Taking the plunge! Can you go into more detail about the test?

post #4 of 51

Uh oh mate, they're not volume-matched. Clear difference!

post #5 of 51
Thread Starter 

Thanks chewy. I've put way too much time into this crap already today and I have to finish my work now. But I will be putting significant time and effort into this over this weekend and I'll be watching this thread. Thanks again for the files. Looking forward to the experimenting.

post #6 of 51
Quote:
Originally Posted by soundstige View Post

Uh oh mate, they're not volume-matched. Clear difference!

Huh? They are on my end. -8.99dB gain for both.

post #7 of 51

A has track gain of -8.28 in its replaygain tag, but B has no such info. Maybe I should just strip the RG tag?

Quote:
Originally Posted by chewy4 View Post

Huh? They are on my end. -8.99dB gain for both.


Edited by soundstige - 2/8/13 at 3:55pm
post #8 of 51

Yeah, they're still the same gain(dbpoweramp must calculate gain differently than foobar?). Just one has the tag saved. I should probably strip it and re-upload.

post #9 of 51
Thread Starter 

I don't use ReplayGain and when I run the foobar ABX component I don't check the ReplayGain checkbox, will that suffice?

post #10 of 51
Quote:
Originally Posted by devhen View Post

I don't use ReplayGain and when I run the foobar ABX component I don't check the ReplayGain checkbox, will that suffice?

Yeah for these it should. I would be worried about it messing up if you did have it checked since apparently the gain is different when calculated by foobar, and it might just grab the gain from the tag for the one file and use foobar's calculation for the other. But the new A that I just uploaded should be fine either way.

post #11 of 51
Thread Starter 

Sounds good. Thanks. Hey how do I access/save my ABX logs?

post #12 of 51

When you hit exit a save thingy pops up.

post #13 of 51
Thread Starter 

Hm I didn't notice that earlier. Ok thanks.

post #14 of 51
Thread Starter 

Wait a minute so why do we have 2 wav files? One is an up-converted mp3?

post #15 of 51

Wowwwwww hard test! Did 7 trials. Probably not enough but my head was bogglin'. Let me know if I should do more (later). Also, I hid the results as I was doing it.

 

Here's the results! I don't even really know what they mean lol! (Click to show)

 

foo_abx 1.3.4 report
foobar2000 v1.1.18
2013/02/08 18:58:46
 
File A: C:\Users\AP\Downloads\A1.wav
File B: C:\Users\AP\Downloads\B1.wav
 
18:58:46 : Test started.
19:11:49 : 01/01  50.0%
19:14:00 : 01/02  75.0%
19:15:18 : 02/03  50.0%
19:15:56 : 03/04  31.3%
19:16:57 : 04/05  18.8%
19:18:23 : 04/06  34.4%
19:21:00 : 05/07  22.7%
19:21:07 : Test finished.
 
 ---------- 
Total: 5/7 (22.7%)

 


Edited by soundstige - 2/8/13 at 4:28pm
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