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High bitrate MP3 vs. Lossless ABX Tests?, Are there any studies...?
Street Samurai
post Jun 2 2005, 00:10
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Hi All,

I've been corrected before on this site for making the statement: "I can tell the difference between an MP3 and lossless". I've never ABX'ed myself but I was wondering if there has been a statistically significant (with regard to population) ABX study done with (say) Lame insane vs. Lossless?

Clearly for myself it makes more sense to do a personal ABX but I was wondering in general about the population.

I searched manually through the posts in this forum (since search seems useless for the term 'mp3') and didn't see anything.

Thanks for help,

ss.

This post has been edited by Street Samurai: Jun 2 2005, 01:02


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Jebus
post Jun 2 2005, 21:32
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To summarize:

a) A "lossless to high-bitrate MP3 ABX" test = a "high-bitrate MP3 ABX" test. No need to specify lossless, all ABX tests are done against a lossless source by definition. A test comparing two codecs (again, against a lossless reference) would be an ABC test.

b) Even the 128kbps tests usually come up with statistically insignificant results because the public just isn't able to distinguish. So the only way you'll ever get interesting results at high-bitrates is to either do it yourself, or read the results of someone who did. Guruboolez is about the best person here for this sort of thing... he can tell the difference on some problem samples, but not must samples.

This post has been edited by Jebus: Jun 2 2005, 21:33
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Zurman
post Jun 2 2005, 22:01
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QUOTE (Jebus @ Jun 2 2005, 12:32 PM)
To summarize:

a) A "lossless to high-bitrate MP3 ABX" test = a "high-bitrate MP3 ABX" test. No need to specify lossless, all ABX tests are done against a lossless source by definition. A test comparing two codecs (again, against a lossless reference) would be an ABC test.
No blink.gif
mp3 ABX test does mean ABX vs original source (or lossless, it's the same), but nothing prevents you from ABXing mp3 vs mpc, mp3@128 vs mp3@256 and so on...

QUOTE
b) Even the 128kbps tests usually come up with statistically insignificant results because the public just isn't able to distinguish. So the only way you'll ever get interesting results at high-bitrates is to either do it yourself, or read the results of someone who did. Guruboolez is about the best person here for this sort of thing... he can tell the difference on some problem samples, but not must samples.
*
True.... Even in this forum, which probably is the place where most motivated and skilled people can be found, 128> listening tests don't involve many people, because all codecs are nowadays excellent (I didn't say perfect, or CD quality...) at any bitrate >= 128...
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Jebus
post Jun 2 2005, 23:12
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QUOTE (Zurman @ Jun 2 2005, 01:01 PM)
QUOTE (Jebus @ Jun 2 2005, 12:32 PM)
To summarize:

a) A "lossless to high-bitrate MP3 ABX" test = a "high-bitrate MP3 ABX" test. No need to specify lossless, all ABX tests are done against a lossless source by definition. A test comparing two codecs (again, against a lossless reference) would be an ABC test.
No blink.gif
mp3 ABX test does mean ABX vs original source (or lossless, it's the same), but nothing prevents you from ABXing mp3 vs mpc, mp3@128 vs mp3@256 and so on...


Okay, fair enough - around here, the ACCEPTIBLE process is to ABX vs the original, since ABXing two different lossy codecs doesn't tell you much of anything, just which one sounds better to you (which could be the OPPOSITE of which one is closer to the source. Some people like the sound of certain codecs).
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Posts in this topic
- Street Samurai   High bitrate MP3 vs. Lossless ABX Tests?   Jun 2 2005, 00:10
- - Defsac   You couldn't do an accurate statistically sign...   Jun 2 2005, 03:23
|- - Cyaneyes   QUOTE (Defsac @ Jun 1 2005, 10:23 PM)You coul...   Jun 2 2005, 03:46
|- - Defsac   QUOTE (Cyaneyes @ Jun 2 2005, 12:46 PM)And th...   Jun 2 2005, 07:05
- - Shade[ST]   QUOTE (Street Samurai @ Jun 1 2005, 05:10 PM)...   Jun 2 2005, 03:30
- - skamp   QUOTE (Street Samurai @ Jun 2 2005, 12:10 AM)...   Jun 2 2005, 07:42
|- - Street Samurai   QUOTE (skamp @ Jun 1 2005, 11:42 PM)"los...   Jun 2 2005, 18:43
|- - Shade[ST]   QUOTE (Street Samurai @ Jun 2 2005, 11:43 AM)...   Jun 2 2005, 19:25
- - Lyx   Why make it complicated: Comparing lossy VS lossl...   Jun 2 2005, 19:09
|- - Street Samurai   QUOTE I've done the search I referred to you, ...   Jun 2 2005, 19:59
- - indybrett   I believe that all of the listening tests compare ...   Jun 2 2005, 20:58
|- - Shade[ST]   Basically, any codec that is transparent versus th...   Jun 2 2005, 21:14
- - Jebus   To summarize: a) A "lossless to high-bitrate...   Jun 2 2005, 21:32
|- - Zurman   QUOTE (Jebus @ Jun 2 2005, 12:32 PM)To summar...   Jun 2 2005, 22:01
|- - Lyx   QUOTE (Zurman @ Jun 2 2005, 11:01 PM)True.......   Jun 2 2005, 22:45
|- - Jebus   QUOTE (Zurman @ Jun 2 2005, 01:01 PM)QUOTE (J...   Jun 2 2005, 23:12
|- - stephanV   QUOTE (Jebus @ Jun 3 2005, 12:12 AM)Okay, fai...   Jun 2 2005, 23:22
|- - Pensive   I'm new, hi everyone, i want to make a suggest...   Jun 3 2005, 00:11
|- - Jebus   QUOTE (Pensive @ Jun 2 2005, 03:11 PM)I'm...   Jun 3 2005, 00:15
||- - Pensive   QUOTE (Jebus @ Jun 3 2005, 12:15 AM)QUOTE (Pe...   Jan 29 2006, 00:39
||- - William   QUOTE (Pensive @ Jan 28 2006, 11:39 PM)For go...   Jan 29 2006, 02:39
||- - Pensive   QUOTE Prove it with ABX results. Okay, my post wa...   Jan 29 2006, 12:21
||- - William   QUOTE (Pensive @ Jan 29 2006, 11:21 AM)Supply...   Jan 29 2006, 16:34
|- - Lyx   QUOTE (Pensive @ Jun 3 2005, 01:11 AM)When i ...   Jun 3 2005, 00:16
- - legg   Related to the first posts... Without the intentio...   Jun 2 2005, 23:16
- - Jebus   yes yes, but what is the point of that? Okay, MP3 ...   Jun 3 2005, 00:13
- - Woodinville   Hmm, there's a bit of confusion in this thread...   Jun 4 2005, 23:56
|- - Lyx   QUOTE (Woodinville @ Jun 5 2005, 12:56 AM)So,...   Jun 5 2005, 02:14
|- - Woodinville   QUOTE (Lyx @ Jun 4 2005, 05:14 PM)The most so...   Jun 5 2005, 02:26
|- - Lyx   QUOTE (Woodinville @ Jun 5 2005, 03:26 AM)Non...   Jun 5 2005, 02:40
- - 2Bdecided   Woodinville, I'm not quite sure what you...   Jun 6 2005, 11:54
|- - Woodinville   QUOTE (2Bdecided @ Jun 6 2005, 02:54 AM)Howev...   Jun 6 2005, 18:46
- - ff123   A few things to note about Roberto's tests: 1...   Jun 6 2005, 20:24
- - Zoom   QUOTE (Pensive @ Jan 28 2006, 06:39 PM)For go...   Jan 29 2006, 02:29
- - Pio2001   In case you don't browse the forum using the s...   Jan 30 2006, 02:19
- - ff123   QUOTE (Pio2001 @ Jan 29 2006, 05:19 PM)I...   Jan 30 2006, 04:23


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